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Stock-Based Compensation Expense - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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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 |

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