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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share Based Compensation [Abstract]        
Option Award Vesting Period     3 years  
Share Based Compensation [Line Items]        
Share-based Compensation Expense in Period, Stock Option Awards $ 892 $ 1,092 $ 1,975 $ 2,245
Stock Options [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-Based Compensation Expense, Stock Option Awards 1,800   $ 1,800  
Weighted Average Remaining Life, Nonvested Stock Awards     2 years 1 month  
Restricted Stock LTIP Plan [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-based Compensation Expense, Nonvested Stock Award 3,100   $ 3,100  
Weighted Average Remaining Life, Nonvested Stock Awards     1 year 11 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     15,544  
Restricted Stock Units (RSUs) LTIP Plan [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-based Compensation Expense, Nonvested Stock Award $ 300   $ 300  
Weighted Average Remaining Life, Nonvested Stock Awards     2 years 2 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     1,480