Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.5.0.2
Basis of Presentation (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
May 18, 2016
$ / shares
shares
Dec. 10, 2014
$ / shares
Nov. 04, 2014
Jan. 09, 2015
USD ($)
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Broadband Spin-Off Distribution Ratio     0.25          
Subscription Rights Discount to Market Percentage   20.00%            
Subscription Rights Period of Time for Calculation of Subscription Price   20 days            
Cash received from rights offering       $ 697,000       $ 697,309
Excess Tax Benefit from Share-based Compensation, Operating Activities               1,200
Liberty                
Related Party Transaction, Amounts of Transaction         $ 661 $ 656 $ 2,400 $ 1,800
Series C                
Subscription rights distribution ratio   0.20            
Share Price | $ / shares $ 56.23 $ 40.36            
Stock Issued During Period, Shares, New Issues | shares 78,300,000     17,277,224