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Stock-Based Compensation Expense - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 22, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Allocated share-based compensation |  | $ 3,428 | $ 2,523 | $ 6,205 | $ 4,289
Selling, general and administrative |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Allocated share-based compensation |  | $ 2,819 | $ 1,887 | $ 4,972 | $ 3,209
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options granted in period (in shares) |  | 0 | 190,000 | 216,494 | 1,100,000
Compensation cost not yet recognized |  | $ 25,900 |  | $ 25,900 |
Compensation cost not yet recognized, period of recognition |  |  |  | 2 years 10 months 24 days |
Stock-Settled Performance-Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Allocated share-based compensation |  | 800 |  | $ 1,100 |
Compensation cost not yet recognized |  | $ 4,200 |  | $ 4,200 |
Compensation cost not yet recognized, period of recognition |  |  |  | 1 year 7 months 6 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] |  |  |  |  |
Stock units granted in period (in shares) |  |  |  | 127,060 |
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 |
Decrease in the potential shares of common stock to be granted |  | 25,415 |  |  |
Stock-Settled Performance-Based Restricted Stock Units | Performance period 1 | 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 | FCF | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  |  |  | 0.00% |
Stock-Settled Performance-Based Restricted Stock Units | Performance period 1 | FCF | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  | 100.00% |  | 100.00% |
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 2 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  |  |  | 250.00% |
Stock-Settled Performance-Based Restricted Stock Units | Performance period 2 | FCF | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  |  |  | 0.00% |
Stock-Settled Performance-Based Restricted Stock Units | Performance period 2 | FCF | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  |  |  | 200.00% |
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 |
Stock-Settled Performance-Based Restricted Stock Units | Performance period 3 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  |  |  | 250.00% |
Stock-Settled Performance-Based Restricted Stock Units | Performance period 3 | FCF | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  |  |  | 0.00% |
Stock-Settled Performance-Based Restricted Stock Units | Performance period 3 | FCF | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  |  |  | 200.00% |
Cash-Settled Performance-Based Share-Based Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Allocated share-based compensation |  | $ 200 |  | $ 400 |
Compensation cost not yet recognized |  | 1,600 |  | $ 1,600 |
Compensation cost not yet recognized, period of recognition |  |  |  | 1 year 9 months 18 days |
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 1 | rTSR |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  |  |  | 125.00% |
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 2 | rTSR |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  |  |  | 250.00% |
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 |
Cash-Settled Performance-Based Share-Based Awards | Performance period 3 | rTSR |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Multiplying factor |  |  |  | 250.00% |
Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period |  |  |  | 1 year |
Compensation cost not yet recognized |  | 1,400 |  | $ 1,400 |
Compensation cost not yet recognized, period of recognition |  |  |  | 6 months |
Restricted Stock Units | Selling, general and administrative |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Allocated share-based compensation |  | $ 31 |  |  |
Restricted Stock Units | Non-employee members |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock units granted | 33,504 |  |  |  |

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