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Stock-Based Compensation Expense - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated share-based compensation $ 2,777 $ 1,766
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options granted in period (in shares) 216,494 909,603
Compensation cost not yet recognized $ 28,400  
Compensation cost not yet recognized, period of recognition 2 years 11 months 4 days  
Stock-Settled Performance-Based Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock units granted in period (in shares) 152,475  
Allocated share-based compensation $ 300  
Compensation cost not yet recognized $ 5,000  
Compensation cost not yet recognized, period of recognition 1 year 9 months 29 days  
Award vesting period 1 year  
Number of shares of common stock for each unit 1  
Stock-Settled Performance-Based Restricted Stock Units | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Multiplying factor 250.00%  
Stock-Settled Performance-Based Restricted Stock Units | FCF | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Multiplying factor 0.00%  
Stock-Settled Performance-Based Restricted Stock Units | FCF | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Multiplying factor 200.00%  
Stock-Settled Performance-Based Restricted Stock Units | rTSR | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Multiplying factor 75.00%  
Stock-Settled Performance-Based Restricted Stock Units | rTSR | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Multiplying factor 125.00%  
Stock-Settled Performance-Based Restricted Stock Units | Performance period 1    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 1 year  
Stock-Settled Performance-Based Restricted Stock Units | Performance period 2    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 2 years  
Stock-Settled Performance-Based Restricted Stock Units | Performance period 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Cash-Settled Performance-Based Share-Based Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated share-based compensation $ 100  
Compensation cost not yet recognized $ 2,200  
Compensation cost not yet recognized, period of recognition 1 year 9 months 29 days  
Cash-Settled Performance-Based Share-Based Awards | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Multiplying factor 250.00%  
Cash-Settled Performance-Based Share-Based Awards | Performance period 1    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 1 year  
Cash-Settled Performance-Based Share-Based Awards | Performance period 2    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 2 years  
Cash-Settled Performance-Based Share-Based Awards | Performance period 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years