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Share-Based and Other Compensation - Nonvested Restricted Stock (Details) - Restricted Stock [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Nonvested Restricted Stock Units RSU [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 0 0
Fair value per share on valuation date (in dollars per share) $ 0 $ 0
Vested Restricted Stock Units RSU [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vested (in shares) (22,884) (24,261)
Total Fair Value at Vest Date $ 1,652 $ 1,781