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Long Term Debt (Narrative) (Details)		12 Months Ended
	Jan. 29, 2019 USD ($) $ / shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jul. 16, 2021 USD ($)
Debt Instrument [Line Items]
Amortization of Debt Discount		$ 10,217,000	$ 9,692,000	$ 8,302,000
Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt outstanding		140,000,000	207,000,000
Line of credit facility, available borrowing capacity		442,500,000
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
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
Effective Interest Rate (percent)	6.14%
Interest Expense, Debt		9,100,000	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%
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 39,100,000
Amortization of Debt Discount		10,200,000	9,700,000	$ 8,300,000
Debt Instrument, Convertible, Conversion Ratio	11.2608
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 88.80
Debt Instrument, Fair Value Disclosure		$ 576,000,000
Convertible Notes Payable [Member] | 2.625 Percent Convertible Notes Due 2024 [Member] | Warrant
Debt Instrument [Line Items]
Option Indexed to Issuer's Equity, Strike Price | $ / shares	$ 114.92
Long-term Debt [Member] | Amended and Restated Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Effective Interest Rate (percent)		1.625%
LIBOR Interest Rate Floor		0.125%
Long-term Debt [Member] | Amended and Restated Senior Credit Agreement [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.50%
Long-term Debt [Member] | Amended and Restated Senior Credit Agreement [Member] | Adjusted LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		1.00%
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 227,600,000
Long-term debt outstanding		$ 226,196,000	$ 240,145,000
Term Loan Facility [Member] | Amended and Restated Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 233,500,000
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)		1.50%
Call Option [Member] | Convertible Notes Payable [Member] | 2.625 Percent Convertible Notes Due 2024 [Member]
Debt Instrument [Line Items]
Hedge and warrant transactions, net cash paid	$ 21,000,000

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