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Share-Based Compensation - Unearned Non-cash shared-based compensation (Details) - USD ($)
$ in Thousands, shares in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-based compensation        
Share-based Compensation.   $ 2,435 $ 2,301 $ 1,044
Unearned non-cash share-based compensation        
Weighted average period for recognition of share-based compensation expense   2 years 4 months 24 days    
Unearned non-cash share-based compensation expense expected to be recognized   $ 5,200    
Estimated forfeiture rate (as a percent)   2.00%    
Restricted Stock Units (RSUs)        
Unearned non-cash share-based compensation        
Granted (in shares) 7.0      
Vesting period 4 years      
Compensation expense   $ 900