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Stockholders' Equity - Compensation Costs Recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restricted Stock Awards        
Class of Stock [Line Items]        
Compensation cost $ 955 $ 967 $ 2,734 $ 3,482
Restricted Stock Units        
Class of Stock [Line Items]        
Compensation cost 235 127 605 364
Stock Option Awards        
Class of Stock [Line Items]        
Compensation cost $ 506 $ 583 $ 1,460 $ 1,957