Annual report pursuant to Section 13 and 15(d)

Income Taxes (Summary of Tax Net Operating Loss Carryforwards) (Details)

v3.8.0.1
Income Taxes (Summary of Tax Net Operating Loss Carryforwards) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Federal  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards $ 371,168
Federal | 2020  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 1,530
Federal | 2021  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 29,615
Federal | 2022  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 14,081
Federal | 2023  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 3,968
Federal | 2024  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 722
Federal | 2025  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 1,536
Federal | 2026  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 663
Federal | 2027  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 1,010
Federal | 2028  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 39,879
Federal | 2029  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 46,537
Federal | 2031  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 104,101
Federal | 2033  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 5,073
Federal | 2034  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 38,561
Federal | 2035  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 13,415
Federal | 2036  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 282
Federal | 2037  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 70,195
State  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 360,700
State | 2020  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 1,505
State | 2021  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 27,814
State | 2022  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 13,850
State | 2023  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 3,903
State | 2024  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 710
State | 2025  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 1,511
State | 2026  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 652
State | 2027  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 993
State | 2028  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 39,226
State | 2029  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 45,756
State | 2031  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 102,639
State | 2033  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 4,968
State | 2034  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 37,312
State | 2035  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 12,743
State | 2036  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards 268
State | 2037  
Operating Loss Carryforwards [Line Items]  
Total tax net operating loss carryforwards $ 66,850