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Debt Instrument, Convertible, Gross Amount of Equity Component

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Up-front costs to purchase hedge instruments, net of cash received from sale of warrants

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- Definition

LIBOR Interest Rate Floor

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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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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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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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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Exercise or strike price stated in the contract for options indexed to the issuer's equity shares.

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Long Term Debt (Narrative) (Details)		12 Months Ended
Long Term Debt (Narrative) (Details)	Jan. 29, 2019 USD ($) $ / shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 07, 2019 USD ($)
Debt Instrument [Line Items]
Amortization of Debt Discount		$ 9,692,000	$ 8,302,000	$ 0
Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt outstanding		207,000,000	220,000,000
Line of credit facility, available borrowing capacity		375,500,000
Revolving Line of Credit [Member] \| Amended and Restated Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 585,000,000.0
Letters of Credit [Member]
Debt Instrument [Line Items]
Letters of credit outstanding		2,500,000
Convertible Notes Payable [Member] \| 2.625 Percent Convertible Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 345,000,000.0
Effective Interest Rate (percent)	6.14%
Interest Expense, Debt		9,100,000	8,400,000
Debt Instrument, Convertible, Gross Amount of Equity Component	$ 51,600,000
Debt Instrument, Interest Rate, Stated Percentage	2.625%
Option Indexed to Issuer's Equity, Strike Price \| $ / shares	$ 114.92
Credit Agreement Expiration Trigger Requirement, Convertible Note Outstanding Balance					150,000,000.0
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 39,100,000
Amortization of Debt Discount		$ 9,700,000	8,300,000
Debt Instrument, Convertible, Conversion Ratio	11.2608
Debt Instrument, Convertible, Conversion Price \| $ / shares	$ 88.80
Long-term Debt [Member] \| Amended and Restated Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Effective Interest Rate (percent)		3.50%
Line of Credit Facility, Commitment Fee Percentage		0.50%
LIBOR Interest Rate Floor		0.50%
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 241,800,000
Long-term debt outstanding		$ 240,145,000	$ 253,535,000
Term Loan Facility [Member] \| Amended and Restated Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 265,000,000.0
Base Rate [Member] \| Long-term Debt [Member] \| Amended and Restated Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		2.00%
London Interbank Offered Rate (LIBOR) [Member] \| Long-term Debt [Member] \| Amended and Restated Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		3.00%
Eurodollar [Member] \| Long-term Debt [Member] \| Amended and Restated Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		3.00%
Call Option [Member]
Debt Instrument [Line Items]
Hedge and warrant transactions, net cash paid	$ 21,000,000.0