Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details)

v3.10.0.1
Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
2014 Plan      
Fair value assumptions      
Dividend rate 0.00% 0.00% 0.00%
2014 Plan | Restricted Stock      
Stock Based Compensation      
Fair value of shares vested $ 112 $ 116 $ 674
Number of awards outstanding unvested (in shares) 24    
Weighted average grant date fair value awards outstanding unvested (in dollars per share) $ 15.33    
2014 Plan | Minimum      
Stock Based Compensation      
Vesting period 1 year    
Term of awards 7 years    
2014 Plan | Minimum | Options      
Stock Based Compensation      
Term of awards 4 years 8 months 12 days 4 years 8 months 12 days 4 years 8 months 12 days
Fair value assumptions      
Volatility rate 24.40% 24.40% 24.40%
2014 Plan | Maximum      
Stock Based Compensation      
Vesting period 5 years    
Term of awards 10 years    
2014 Plan | Maximum | Options      
Stock Based Compensation      
Term of awards 5 years 3 months 18 days 5 years 3 months 18 days 5 years 3 months 18 days
Fair value assumptions      
Volatility rate 26.20% 26.20% 26.20%
LTIPs | Skyhook | PARs and PSUs | Level 2 | Other liabilities      
Stock Based Compensation      
Deferred compensation $ 1,100 $ 1,200