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Stockholders' Equity - Compensation Costs Recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restricted Stock Awards        
Class of Stock [Line Items]        
Compensation cost $ 936 $ 812 $ 1,779 $ 2,515
Restricted Stock Units        
Class of Stock [Line Items]        
Compensation cost 220 153 370 237
Stock Option Awards        
Class of Stock [Line Items]        
Compensation cost $ 508 $ 624 $ 954 $ 1,374