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Stock-based Compensation - Compensation Cost Recognized for Stock Options and Restricted Stock Awards (Parenthetical) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Total compensation cost for share-based payment arrangement, Net of tax $ 0 $ 0