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Share-Based Compensation - Unearned Non-cash shared-based compensation (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock-based compensation          
Share-based Compensation.       $ 1,514 $ 1,140
Unearned non-cash share-based compensation          
Weighted average period for recognition of share-based compensation expense       2 years 2 months 12 days  
Unearned non-cash share-based compensation expense expected to be recognized   $ 6,000   $ 6,000  
Estimated forfeiture rate (as a percent)       2.00%  
Compensation expense   $ 300 $ 300 $ 600 $ 300
Restricted Stock Units (RSUs)          
Unearned non-cash share-based compensation          
Granted (in shares) 7,000,000        
Vesting period 4 years