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Financing Arrangements (Details) $ / shares in Units, shares in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 21, 2021 USD ($) | Nov. 24, 2020 USD ($) $ / shares | Apr. 12, 2017 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 22, 2021 USD ($) | Oct. 22, 2020 shares | Jun. 30, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 218,172,000 | $ 218,172,000 | $ 148,810,000 |  |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  |  | $ 10,366,000 | 8,987,000 | $ 8,112,000 |  |  |
Payments for Repurchase of Equity, Prepaid Forward |  |  | $ 78,000,000.0 |  |  |  |  |  |  |  |
Treasury Shares Acquired, Estimated, Prepaid Forward | shares |  |  |  |  |  | 9,200 |  |  |  |  |
Operating Lease, Impairment Loss |  |  |  |  |  | $ 12,460,000 | 0 | 0 |  |  |
Own-share Lending Arrangement, Shares, Issued | shares |  |  | 9,200 |  |  |  |  |  |  |  |
SharesPurchasedUnderPrepaidForward | shares |  |  |  |  |  |  |  |  |  | 8,800 |
Proceeds from Issuance of Debt |  |  |  |  |  | $ 143,750,000 | 0 | 0 |  |  |
Debt Instrument, Covenant Compliance, Asset Coverage Ratio |  |  |  |  | 1.50 | 1.50 |  |  |  |  |
Adjustments to Additional Paid in Capital, Capped Call Option, Issuance Costs |  |  |  |  |  | $ (10,249,000) |  |  |  |  |
Option Indexed To Issuers Equity, cap price |  |  |  |  | $ 12.0925 | 12.0925 |  |  |  |  |
Payments to repurchase convertible debt |  |  |  |  | 50,000,000.0 |  |  |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities |  |  |  |  | 200,000 | 6,717,000 | 6,179,000 | 6,125,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | 5,389,000 | 0 | 0 |  |  |
Option Indexed To Issuers Equity, cap price |  |  |  |  | 12.0925 | 12.0925 |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  | 143,750,000 | 0 | 0 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | 5,389,000 | 0 | 0 |  |  |
Convertible Senior Notes due 2025 [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  | $ 125,000,000.0 |  |  |  |  |  |  |  |  |
2016 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit agreement, current borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0
Credit agreement, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 300,000,000.0
Minimum Fixed Charge Coverage Ratio, minimum balance |  |  |  | $ 25,000,000.0 |  |  |  |  |  |  |
Minimum Fixed Charge Coverage Ratio, minimum percent |  |  |  | 10.00% |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | 0 | 0 | 0 |  |  |  |
2021 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit agreement, current borrowing capacity |  |  |  |  |  |  |  |  | $ 50,000,000.0 |  |
Minimum Fixed Charge Coverage Ratio, minimum balance | $ 10,000,000.0 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Minimum Liquidity Requirement, Amount | 55,000,000.0 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Qualified Cash | $ 40,000,000.0 |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  | $ 175,000,000.0 |  |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount |  |  | $ 128,300,000 |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  | 10,200,000 | 10,200,000 | 24,300,000 |  |  |  |
Interest rate |  |  | 3.50% |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  | 94.0071 |  |  |  |  |  |  |  |
Convertible Debt Principal Amount Conversion |  |  | $ 1,000 |  | $ 125,000,000.0 | 125,000,000.0 | 175,000,000.0 |  |  |  |
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 |  |  |  |  | $ 114,000,000.0 | 114,000,000.0 | 148,800,000 |  |  |  |
Interest Expense, Debt |  |  |  |  |  | 5,900,000 | 6,100,000 | 6,100,000 |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  | 800,000 | 800,000 | 800,000 |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  |  | 9,600,000 | 9,000,000.0 | $ 8,100,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | 5,400,000 |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  | 56,200,000 | 56,200,000 |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  | 45,200,000 | 45,200,000 |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  | 56,200,000 | 56,200,000 |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | 5,400,000 |  |  |  |  |
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 |  |  |  |  | 800,000 | 800,000 | $ 1,900,000 |  |  |  |
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 |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  | 36,100,000 | 36,100,000 |  |  |  |  |
Interest rate |  | 1.25% |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  | 107.1984 |  |  |  |  |  |  |  |  |
Convertible Debt Principal Amount Conversion |  | $ 1,000 |  |  | $ 143,800,000 | 143,800,000 |  |  |  |  |
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 |  |  |  |  | $ 104,200,000 | 104,200,000 |  |  |  |  |
Interest Expense, Debt |  |  |  |  |  | 200,000 |  |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  | 100,000 |  |  |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  |  | 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 |  |  |  |  | $ 3,400,000 | $ 3,400,000 |  |  |  |  |
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] | 2016 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused Capacity, Commitment Fee Percentage |  |  |  | 0.25% |  |  |  |  |  |  |
Minimum [Member] | 2021 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused Capacity, Commitment Fee Percentage | 0.375% |  |  |  |  |  |  |  |  |  |
Maximum [Member] | 2016 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] | 2016 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis Spread on Variable Rate |  |  |  | 1.50% |  |  |  |  |  |  |
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] | 2016 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis Spread on Variable Rate |  |  |  | 2.00% |  |  |  |  |  |  |
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] | 2016 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis Spread on Variable Rate |  |  |  | 0.50% |  |  |  |  |  |  |
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] | 2016 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis Spread on Variable Rate |  |  |  | 1.00% |  |  |  |  |  |  |
Base Rate [Member] | Maximum [Member] | 2021 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis Spread on Variable Rate | 1.00% |  |  |  |  |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. + References No definition available. + Details
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