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Financial Commitments (Narrative) (Details) |  | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 18, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 | Jun. 15, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 19, 2020 USD ($) | Apr. 20, 2017 USD ($) | Jun. 15, 2016 USD ($)
BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Applicable margin on overdue amounts (as a percent) | 2.00% |  |  |  |  |  |  |
First Lien | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio (maximum) | 1.35 |  |  |  |  |  |  |
2020 Revolver | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio (maximum) | 2.75 |  |  |  |  |  |  |
Weighted-average annual interest rate on borrowings |  | 6.50% |  |  |  |  |  |
Remaining borrowing capacity |  | $ 175,000,000 |  |  |  |  |  |
Forecast | 2020 Revolver | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio (maximum) |  |  | 2.25 |  |  |  |  |
Line of Credit | 2020 Credit Agreement | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 425,000,000.0 |  |  |  |  |  |  |
Premium fee (as a percent) | 1.00% |  |  |  |  |  |  |
Periodic payment principal percentage | 0.25% |  |  |  |  |  |  |
Unsecured Debt | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total net leverage ratio (maximum) | 3.50 |  |  |  |  |  |  |
Fixed charge coverage ratio (maximum) | 2.00 |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 200,000,000
Interest rate |  |  |  |  |  |  |  | 2.875%
Aggregate principal repurchase face amount |  |  |  |  |  | $ 130,100,000 |  |
Aggregate principal repurchase amount |  |  |  |  |  | $ 132,400,000 |  |
Current principal amount |  | 0 |  | $ 69,900,000 | $ 69,918,000 |  |  |
Senior Notes | 2017 Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current principal amount |  | $ 500,000,000 |  |  | 500,000,000 |  |  |
Senior Notes | Private Placement | 2017 Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 500,000,000 |
Interest rate |  |  |  |  |  |  | 6.875% |
Redemption price, change of control triggering event (as a percent) |  | 101.00% |  |  |  |  |  |
Revolving Credit Facility | 2017 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  | $ 2,600,000 |  |  |
Revolving Credit Facility | 2020 Credit Agreement | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Increase in line of credit | $ 173,500,000 |  |  |  |  |  |  |
Accordion feature, percentage of LTM EBITDA | 50.00% |  |  |  |  |  |  |
Revolving Credit Facility | 2020 Revolver |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 2,400,000 |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | 2020 Credit Agreement | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 175,000,000.0 |  |  |  |  |  |  |
Secured Debt | Junior Lien | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total net leverage ratio (maximum) | 3.50 |  |  |  |  |  |  |
Letters Of Credit | Line of Credit | 2020 Credit Agreement | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 75,000,000.0 |  |  |  |  |  |  |
Bridge Loan | Line of Credit | 2020 Credit Agreement | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 10,000,000.0 |  |  |  |  |  |  |
Federal Funds Rate | 2020 Credit Agreement | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |
LIBOR | 2020 Credit Agreement | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |
LIBOR | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 4.75% |  |  |  |  |  |  |
LIBOR | 2020 Revolver | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 4.75% |  |  |  |  |  |  |
LIBOR | Minimum | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 4.50% |  |  |  |  |  |  |
LIBOR | Minimum | 2020 Revolver | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 4.25% |  |  |  |  |  |  |
LIBOR | Maximum | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 4.75% |  |  |  |  |  |  |
LIBOR | Maximum | 2020 Revolver | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 4.75% |  |  |  |  |  |  |
Base Rate | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.75% |  |  |  |  |  |  |
Base Rate | 2020 Revolver | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.75% |  |  |  |  |  |  |
Base Rate | Minimum | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.50% |  |  |  |  |  |  |
Base Rate | Minimum | 2020 Revolver | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.25% |  |  |  |  |  |  |
Base Rate | Maximum | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.75% |  |  |  |  |  |  |
Base Rate | Maximum | 2020 Revolver | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.75% |  |  |  |  |  |  |

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