Debt Instrument, Debt Default, Increase in Applicable Margin On Overdue Amounts Upon Default

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Debt Instrument, Periodic Payment, Principal, Percentage

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Upon the occurrence of a change of control triggering event specified in the Indenture, the Company must offer to purchase the Senior Notes at a redemption price expressed as percentage of the principal amount thereof, plus accrued and unpaid interest, if any, to the date of purchase.

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Fixed Charge Coverage Ratio (Maximum)

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Line Of Credit Facility, Accordion Feature, Percentage of LTM EBITDA

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Line of Credit Facility, Premium Fee, Percentage

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- Definition

Net Leverage Ratio (Maximum)

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Total Net Leverage Ratio (Maximum)

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value amount of debt instrument that was repurchased.

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Face (par) amount of the original debt instrument that was repurchased.

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Weighted average interest rate of debt outstanding.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of increase (decrease) of the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Financial Commitments (Narrative) (Details)		9 Months Ended
Financial Commitments (Narrative) (Details)	Aug. 18, 2020 USD ($)	Sep. 30, 2020 USD ($) $ / shares	Mar. 31, 2022	Aug. 19, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Long-term debt		$ 1,021,023,000			$ 834,476,000
Conversion ratio		0.0330579
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
Debt Instrument [Line Items]
Long-term debt		$ 0
2020 Revolver \| BMO Harris Bank
Debt Instrument [Line Items]
Net leverage ratio (maximum)	2.75
Weighted-average annual interest rate on borrowings		7.00%
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
Long-term debt		$ 66,803,000			182,292,000
Interest rate		2.875%
Aggregate principal repurchase face amount				$ 130,100,000
Aggregate principal repurchase amount				$ 132,400,000
Current principal amount		$ 69,918,000			200,000,000
Conversion price (in dollars per share) \| $ / shares		$ 30.25
Senior Notes \| 2017 Senior Notes
Debt Instrument [Line Items]
Long-term debt		$ 495,039,000			494,365,000
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					3,700,000
Maximum borrowing capacity		$ 350,000,000
Weighted-average annual interest rate on borrowings		3.54%
Long-term debt					$ 114,000,000
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		$ 2,800,000
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 \| 2017 Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		150,000,000
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 \| 2017 Credit Facility
Debt Instrument [Line Items]
Face amount		$ 10,000,000
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%