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Stock Compensation - Restricted Stock and Performance Share Grants - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost not yet recognized     $ 3,308  
Weighted-average recognition period of compensation cost     22 months  
Modified share-based awards   $ 1,065 $ 0 $ 1,065
Performance share grants | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance milestone grants (in shares) 133,890      
New performance share grants (in shares) 89,837      
Modifications annual cost     1,109  
Total value for grants at maximum performance     $ 5,702