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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share Based Compensation [Abstract]        
Option Award Vesting Period     3 years  
Share Based Compensation [Line Items]        
Share-based Compensation Expense in Period, Stock Option Awards $ 660 $ 892 $ 1,672 $ 1,975
Stock Options [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-based Compensation Expense, Nonvested Stock Award 800   $ 800  
Weighted Average Remaining Life, Nonvested Stock Awards     1 year 4 months 24 days  
Restricted Stock LTIP Plan [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-based Compensation Expense, Nonvested Stock Award 1,900   $ 1,900  
Weighted Average Remaining Life, Nonvested Stock Awards     1 year 3 months 18 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     3,565  
Restricted Stock Units (RSUs) LTIP Plan [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-based Compensation Expense, Nonvested Stock Award $ 100   $ 100  
Weighted Average Remaining Life, Nonvested Stock Awards     1 year 6 months