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Borrowings and Lines of Credit Borrowings and Lines of Credit - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Sep. 04, 2020 USD ($)	Oct. 11, 2017 USD ($)	May 04, 2016 USD ($) $ / shares
Debt Instrument [Line Items]
Long-term debt	$ 70,000,000.0	$ 165,100,000
Long-term Debt, Current Maturities	$ 0	$ 165,100,000
Debt Instrument, Convertible, Conversion Ratio	54.2741
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 18.4250
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | $ / shares	$ 0	$ 0.04	$ (0.01)
Long-term debt	$ 70,000,000.0	$ 0
Net deferred tax asset	$ 78,100,000	17,900,000
Document Fiscal Year Focus	2021
Convertible Notes Due Twenty Twenty One [Member] | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, face amount		172,500,000				$ 172,500,000
Debt instrument, convertible, carrying amount of equity component						$ 29,900,000
Interest Expense, Debt, Excluding Amortization	$ 4,700,000	5,600,000	$ 5,600,000
Amortization of Debt Issuance Costs	800,000	900,000	900,000
Amortization of Debt Discount (Premium)	6,600,000	7,400,000	6,800,000
Debt Instrument, Unamortized Discount		(7,400,000)
Convertible Notes Payable		165,100,000
Convertible Notes Payable, Current		165,100,000
Convertible Notes Payable, Noncurrent		0
Debt Instrument, Fair Value Disclosure		196,500,000
Payments for Hedge, Financing Activities	44,500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares						$ 21.1050
Proceeds from issuance of warrants	39,100,000
Interest Expense, Debt	12,100,000	13,900,000	$ 13,300,000
Credit Facility Due October 11, 2022 [Member] | Line of Credit
Debt Instrument [Line Items]
Long-term Line of Credit	$ 70,000,000.0
Term Loan and Revolving Credit Facility Due January 2019 [Member] | Line of Credit
Debt Instrument [Line Items]
Long-term Line of Credit		0
Credit Facility due January 2, 2024 [Member]
Debt Instrument [Line Items]
Debt covenant, EBITDA to interest ratio	3.25
Debt Instrument, Covenant, Debt to EBITDA, Maximum	3.75
Debt Instrument, Covenant, Senior Secured Leverage Ratio, Maximum	3.25
Line of credit facility, maximum borrowing capacity				$ 400,000,000
Credit Facility due January 2, 2024 [Member] | Line of Credit
Debt Instrument [Line Items]
Long-term Line of Credit	$ 70,000,000.0	0
Line of Credit, Current	$ 0	$ 0
London Interbank Offered Rate (LIBOR) | Credit Facilities
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	2.25%	2.20%	3.98%
Minimum | Credit Facility due January 2, 2024 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.50%
Minimum | Credit Facility due January 2, 2024 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.225%
Minimum | London Interbank Offered Rate (LIBOR) | Credit Facility due January 2, 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Maximum | Credit Facility due January 2, 2024 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	1.50%
Maximum | Credit Facility due January 2, 2024 [Member]
Debt Instrument [Line Items]
Line of credit facility, accordion feature, increase limit					$ 200,000,000
Line of Credit Facility, Commitment Fee Percentage	0.375%
Maximum | London Interbank Offered Rate (LIBOR) | Credit Facility due January 2, 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Weighted Average | Credit Facilities
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.26%	0.26%	0.23%

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