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Stock Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share Based Compensation [Abstract]        
Option Award Vesting Period     3 years  
Share Based Compensation [Line Items]        
Share-based Compensation Expense in Period, Stock Option Awards $ 1,092 $ 1,625 $ 2,245 $ 3,423
Stock Options [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-Based Compensation Expense, Stock Option Awards 1,700   $ 1,700  
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 3,400   $ 3,400  
Weighted Average Remaining Life, Nonvested Stock Awards     1 year 10 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     17,315  
Restricted Stock Units (RSUs) LTIP Plan [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-based Compensation Expense, Nonvested Stock Award $ 200   $ 200  
Weighted Average Remaining Life, Nonvested Stock Awards     2 years 1 month  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     1,332