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Debt and Credit Agreements - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt Obligation | $ 1,361,642 | $ 1,300,532
Less: deferred financing costs | (18,887) | (15,767)
Total debt obligations, net of deferred financing costs | 1,342,755 | 1,284,765
Current maturities of long-term debt | (9,181) | (13,576)
Long-term debt | 1,333,574 | 1,271,189
Other financing payable (including finance leases) in varying amounts |  |
Debt Instrument [Line Items] |  |
Debt Obligation | 24,406 | 21,344
Term Loan Facility | New Term Loan |  |
Debt Instrument [Line Items] |  |
Debt Obligation | 498,750 | 0
Term Loan Facility | Term Loan A |  |
Debt Instrument [Line Items] |  |
Debt Obligation | 0 | 280,000
Term Loan Facility | Term Loan B |  |
Debt Instrument [Line Items] |  |
Debt Obligation | 0 | 218,188
Line of Credit | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Debt Obligation | 338,486 | 281,000
Senior Notes | 5.75% Notes, due July 31, 2027 |  |
Debt Instrument [Line Items] |  |
Debt Obligation | $ 500,000 | $ 500,000

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