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Financial Commitments (Narrative) (Details) |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 18, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 | Dec. 31, 2021 USD ($) | Aug. 19, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan outstanding |  | $ 1,025,465,000 | $ 834,476,000 |  |  |  |  |
Restricted cash held to repay outstanding debt |  | $ 69,900,000 |  |  |  |  |  |
Initial conversion rate |  | 0.0330579 |  |  |  |  |  |
BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Increase in applicable margin on overdue amounts upon default | 2.00% |  |  |  |  |  |  |
Credit Facility 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan outstanding |  | $ 0 |  |  |  |  |  |
Credit Facility 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio (maximum) | 2.75 |  |  |  |  |  |  |
Weighted-average annual interest rate on borrowings |  | 6.74% |  |  |  |  |  |
Available borrowing capacity |  | $ 175,000,000 |  |  |  |  |  |
First Lien | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio (maximum) | 1.35 |  |  |  |  |  |  |
Equity Component |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | 1,500,000 |  |  |  |  |  |
Liability Component |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | 5,100,000 |  |  |  |  |  |
Forecast | Credit Facility 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio (maximum) |  |  |  |  |  | 2.25 |  |
Line of Credit | Credit Agreement 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 425,000,000.0 |  |  |  |  |  |  |
Premium percentage | 1.00% |  |  |  |  |  |  |
Initial principal amount installment percentage | 0.25% |  |  |  |  |  |  |
Unsecured Debt | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed charge coverage ratio (maximum) | 2.00 |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  | 200,000,000 |  |  |  |  |  |
Loan outstanding |  | $ 67,878,000 | 182,292,000 |  |  |  |  |
Interest rate (as a percent) |  | 2.875% |  |  |  |  |  |
Repurchased face amount |  |  |  |  |  |  |  | $ 130,100,000
Aggregate repurchase price |  |  |  |  |  |  |  | $ 132,400,000
Conversion price (in dollars per share) | $ / shares |  | $ 30.25 |  |  |  |  |  |
Convertible Debt | Equity Component |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 1,543,000 | 1,543,000 |  |  |  |  |
Conversion feature |  | 46,800,000 | 46,800,000 |  |  |  |  |
Convertible Debt | Liability Component |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | 5,051,000 | 5,051,000 |  |  |  |  |
Face amount |  | 69,918,000 | 200,000,000 |  |  |  |  |
Issuance of convertible notes |  |  | 153,200,000 |  |  |  |  |
2017 Senior Notes | 2017 Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan outstanding |  | 495,271,000 | 494,365,000 |  |  |  |  |
2017 Senior Notes | Private Placement | 2017 Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  | $ 500,000,000 |  |  |  |  |  |
Interest rate (as a percent) |  | 6.875% |  |  |  |  |  |
Redemption price, change of control triggering event (as a percent) |  | 101.00% |  |  |  |  |  |
Equipment Financing Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan outstanding |  | $ 36,900,000 | 27,700,000 |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Term of debt |  | 7 years |  |  |  |  |  |
Equipment Financing Loans | Forecast |  |  |  |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Balloon payments |  |  |  |  | $ 6,300,000 |  | $ 12,400,000 |
Mortgages |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan outstanding |  | $ 10,700,000 | 11,500,000 |  |  |  |  |
Interest rate (as a percent) |  | 3.50% |  |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Term of debt |  | 10 years |  |  |  |  |  |
Mortgages | Forecast |  |  |  |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Balloon payments |  |  |  | $ 6,800,000 |  |  | $ 2,900,000 |
Minimum | Equipment Financing Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 2.74% |  |  |  |  |  |
Maximum | Equipment Financing Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.89% |  |  |  |  |  |
Credit Facility | Credit Facility 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 2,600,000 |  |  |  |  |  |
Credit Facility | 2017 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  | 3,700,000 |  |  |  |  |
Maximum borrowing capacity |  | $ 350,000,000 |  |  |  |  |  |
Weighted-average annual interest rate on borrowings |  | 3.55% |  |  |  |  |  |
Loan outstanding |  |  | $ 114,000,000 |  |  |  |  |
Credit Facility | Credit Agreement 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Increase in line of credit allowed amount | $ 173,500,000 |  |  |  |  |  |  |
Accordion feature percentage of LTM EBITDA | 50.00% |  |  |  |  |  |  |
Credit Facility | Line of Credit | Credit Agreement 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 175,000,000.0 |  |  |  |  |  |  |
Letters Of Credit | 2017 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 150,000,000 |  |  |  |  |  |
Letters Of Credit | Line of Credit | Credit Agreement 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | 75,000,000.0 |  |  |  |  |  |  |
Bridge Loan | 2017 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  | $ 10,000,000 |  |  |  |  |  |
Bridge Loan | Line of Credit | Credit Agreement 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 10,000,000.0 |  |  |  |  |  |  |
Secured Debt | Unsecured Debt | BMO Harris Bank | Junior Lien |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total net leverage ratio (maximum) | 3.50 |  |  |  |  |  |  |
Federal Funds Rate | Credit Agreement 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 0.50% |  |  |  |  |  |  |
LIBOR | Credit Facility 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 4.75% |  |  |  |  |  |  |
LIBOR | Credit Agreement 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 1.00% |  |  |  |  |  |  |
LIBOR | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 4.75% |  |  |  |  |  |  |
LIBOR | Mortgages |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) |  | 3.00% |  |  |  |  |  |
LIBOR | Minimum | Credit Facility 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 4.25% |  |  |  |  |  |  |
LIBOR | Minimum | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 4.50% |  |  |  |  |  |  |
LIBOR | Maximum | Credit Facility 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 4.75% |  |  |  |  |  |  |
LIBOR | Maximum | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 4.75% |  |  |  |  |  |  |
Base Rate | Credit Facility 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 3.75% |  |  |  |  |  |  |
Base Rate | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 3.75% |  |  |  |  |  |  |
Base Rate | Minimum | Credit Facility 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 3.25% |  |  |  |  |  |  |
Base Rate | Minimum | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 3.50% |  |  |  |  |  |  |
Base Rate | Maximum | Credit Facility 2020 | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 3.75% |  |  |  |  |  |  |
Base Rate | Maximum | Term Loan B | BMO Harris Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 3.75% |  |  |  |  |  |  |

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