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Stock Compensation - Restricted Stock and Performance Share Grants - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2014
Jun. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost not yet recognized   $ 4,679  
Total compensation cost not yet recognized, period for recognition   25 months  
Modified share-based awards   $ 1,065  
Performance share grants      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
New stock grants/additional shares due to maximum achievement   83,968 165,996
Performance share grants | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional shares authorized 133,890    
New stock grants/additional shares due to maximum achievement 89,837    
Modifications annual cost   $ 1,109  
Additional Paid-In Capital      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Modified share-based awards   $ 1,065