Financing Arrangements (Details) $ / shares in Units, shares in Thousands				3 Months Ended		12 Months Ended
	Jan. 21, 2021 USD ($)	Nov. 24, 2020 USD ($) $ / shares	Apr. 12, 2017 USD ($) $ / shares shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Jan. 01, 2022 USD ($)	Apr. 01, 2021 shares	Jan. 22, 2021 USD ($)	Oct. 22, 2020 shares
Line of Credit Facility [Line Items]
Long-term debt				$ 141,017,000	$ 111,289,000	$ 141,017,000	$ 111,289,000
Amortization of Debt Discount (Premium)						0	$ 14,208,000	$ 10,366,000
Payments for Repurchase of Equity, Prepaid Forward			$ 78,000,000
Treasury Shares Acquired, Estimated, Prepaid Forward | shares					9,200		9,200
Operating Lease, Impairment Loss						0	$ 0	12,460,000
Own-share Lending Arrangement, Shares, Issued | shares			9,200
SharesPurchasedUnderPrepaidForward | shares										400		8,800
Proceeds from Issuance of Debt						$ 0	0	143,750,000
Debt Instrument, Covenant Compliance, Asset Coverage Ratio				1.50		1.50
Adjustments to Additional Paid in Capital, Capped Call Option, Issuance Costs		$ (10,200,000)						(10,249,000)
Option Indexed To Issuers Equity, cap price		12.0925
Payments to repurchase convertible debt		50,000,000
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		200,000				$ 4,258,000	6,127,000	6,717,000
Gain (Loss) on Extinguishment of Debt						0	0	(5,389,000)
Letters of Credit Outstanding, Amount				$ 5.2		5.2
Debt Instrument, Periodic Payment, Interest						2,200,000
Convertible Senior Notes due 2022 [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Unamortized Discount				0		0
Convertible Debt Principal Amount Conversion				$ 0	$ 125,000,000	0	125,000,000
Amortization of Debt Issuance Costs						200,000
Amortization of Debt Discount (Premium)						0
Repayments of Debt						125,000,000
Convertible Senior Notes due 2025 [Member] | Private Placement [Member]
Line of Credit Facility [Line Items]
Debt Instrument		$ 125,000,000
2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit agreement, current borrowing capacity											$ 50,000,000
Minimum Fixed Charge Coverage Ratio, minimum balance	$ 10,000,000
Line of Credit Facility, Unused Capacity, Minimum Liquidity Requirement, Amount	55,000,000
Line of Credit Facility, Unused Capacity, Qualified Cash	$ 40,000,000
Convertible Senior Notes due 2022 [Member]
Line of Credit Facility [Line Items]
Debt Instrument			$ 175,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Amount			$ 128,300,000						$ 2,300,000
Debt Instrument, Unamortized Discount					2,400,000		2,400,000
Interest rate			3.50%
Debt Instrument, Convertible, Conversion Ratio			94.0071
Convertible Debt Principal Amount Conversion			$ 1,000
Debt Instrument, Convertible, Conversion Price | $ / shares			$ 10.64
Convertible debt, equity portion			$ 46,700,000
Effective rate		2.40%	10.50%
Debt Issuance Costs, Net			$ 5,700,000
Percentage of conversion price of notes				130.00%
Percentage of trading price of notes				98.00%
Long-term debt				$ 0	122,400,000	0	122,400,000
Interest Expense, Debt						1,300,000	4,400,000	5,900,000
Amortization of Debt Issuance Costs							600,000	800,000
Amortization of Debt Discount (Premium)							7,800,000	9,600,000
Gain (Loss) on Extinguishment of Debt		$ 5,400,000
Debt Instrument, Repurchase Amount		56,200,000
Debt Instrument, Repurchased Face Amount		45,200,000
Convertible Senior Notes due 2022 [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross			4,200,000
Debt Issuance Costs, Net				0	200,000	0	200,000
proceedsfromconvertibledebtamountallocatedtodebtcomponent		50,600,000
Convertible Senior Notes due 2022 [Member] | Additional Paid-in Capital [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross			$ 1,500,000
proceedsfromconvertibledebtamountallocatedtoequitycomponent		5,400,000
Convertible Senior Notes due 2025 [Member]
Line of Credit Facility [Line Items]
Debt Instrument		143,800,000
Long-term Debt, Percentage Bearing Fixed Interest, Amount		$ 106,900,000							$ 28,800,000
Debt Instrument, Unamortized Discount				0	29,800,000	0	29,800,000
Interest rate		1.25%
Debt Instrument, Convertible, Conversion Ratio		107.1984
Convertible Debt Principal Amount Conversion		$ 1,000		$ 143,800,000	143,800,000	143,800,000	143,800,000
Debt Instrument, Convertible, Conversion Price | $ / shares		$ 9.3285
Convertible debt, equity portion		$ 36,900,000
Effective rate		7.50%
Debt Issuance Costs, Net		$ 4,700,000
Percentage of conversion price of notes				130.00%
Percentage of trading price of notes				98.00%
Long-term debt				$ 141,000,000	111,300,000	141,000,000	111,300,000
Interest Expense, Debt						1,800,000	1,800,000	200,000
Amortization of Debt Issuance Costs						1,000,000	700,000	100,000
Amortization of Debt Discount (Premium)						0	6,400,000	$ 800,000
Convertible Senior Notes due 2025 [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross		3,500,000
Debt Issuance Costs, Net				$ 3,000,000	$ 2,700,000	$ 3,000,000	$ 2,700,000
Convertible Senior Notes due 2025 [Member] | Additional Paid-in Capital [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross		1,200,000
Convertible Senior Notes due 2025 [Member] | Over-Allotment Option [Member]
Line of Credit Facility [Line Items]
Debt Instrument		$ 18,800,000
Minimum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Unused Capacity, Commitment Fee Percentage	0.375%
Maximum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Unused Capacity, Commitment Fee Percentage	0.50%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	1.50%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	2.00%
Base Rate [Member] | Minimum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	0.50%
Base Rate [Member] | Maximum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	1.00%