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Long-Term Debt (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instruments [Abstract] |  |  |
Credit facility | $ 42,000 | $ 0 |
Deferred financing costs | (6,407) | (9,678) |
Long-term debt | 500,937 | 455,666 |
Less current portion | 0 | 0 |
Long-term debt, less current portion | 500,937 | 455,666 |
Loss on early extinguishment of debt | 0 | 0 | $ 8,073
Interest expense [Abstract] |  |  |
Contractual coupon interest |  |  | 12,185
Non-cash amortization of debt discount | 0 | 0 | 13,161
Other Noncash Interest Expense (Income) |  |  | 1,623
Total interest expense related to the debentures |  |  | 26,969
Principal amount of repurchased debt |  |  | 151,546
Committed and uncommitted short-term credit lines | 1,000 | 1,000 |
Aggregate annual maturities of long-term debt [Abstract] |  |  |
Interest paid | 13,739 | 14,177 | 15,450
Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Line of credit facility, maximum borrowing capacity | $ 750,000 |  |
Line of credit facility, expiration date | Jun. 05, 2024 |  |
Incremental revolving commitments | $ 300,000 |  |
Basis spread on variable rate | 1.50% |  |
Commitment fees | 0.25% |  |
Investments pro forma ratio | 2.75 |  |
Restricted payments pro forma ratio | 2.5 |  |
Restricted payments, annual limit | $ 100,000 |  |
Restricted payments ,total limit | 300,000 |  |
Restricted payments ,rollover limit | 25,000 |  |
Restricted payments, unused amount | 100,000 |  |
Event of default - judgment limit | 50,000 |  |
Available borrowing capacity | 707,061 | 748,931 |
Letters of credit outstanding | 939 | 1,069 |
Convertible Senior Notes, Due 2025 [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Convertible debt | $ 465,344 | 465,344 |
Issuance date | Jun. 12, 2018 |  |
Maturity date | Jun. 15, 2025 |  |
Cash coupon rate | 2.25% |  |
Nonconvertible debt borrowing rate at issuance | 5.50% |  |
Effective conversion rate | 32.0478 |  |
Effective conversion price (in dollars per share) | $ 31.2 |  |
130% of the conversion price (in dollars per share) | $ 40.56 |  |
Debt instrument percentage of conversion price | 130.00% |  |
Debt instrument, percentage of sale price of common stock | 98.00% |  |
Maximum threshold of quarterly cash dividends per share of common stock for not adjusting conversion rate of convertible notes (in dollars per share) | $ 0.085 |  |
Purchase price of extinguished debt |  | 128,328 |
Allocated liability component of repurchased debt |  | 118,587 |
Allocated equity component of repurchased debt |  | 9,741 |
Loss on early extinguishment of debt |  | 4,600 |
Liability and equity components of convertible debentures [Abstract] |  |  |
Principal amount of the convertible debt | $ 465,344 |  |
Carrying value of liability component |  | 465,344 |
Interest expense [Abstract] |  |  |
Contractual coupon interest | 10,470 | 10,470 | 12,097
Non-cash amortization of debt discount | 0 | 0 | 13,118
Other Noncash Interest Expense (Income) | 1,733 | 1,733 | 1,623
Total interest expense related to the debentures | $ 12,203 | 12,203 | 26,838
Principal amount of repurchased debt |  | 134,656 |
Net carrying value of repurchased debt |  | 115,978 |
Convertible Senior Debentures, Due 2040 [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Allocated liability component of repurchased debt |  | $ 300 |
Convertible Senior Debentures, Due 2041 [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Purchase price of extinguished debt |  |  | 23,355
Allocated liability component of repurchased debt |  |  | 10,075
Allocated equity component of repurchased debt |  |  | 13,280
Loss on early extinguishment of debt |  |  | 3,473
Interest expense [Abstract] |  |  |
Principal amount of repurchased debt |  |  | 16,890
Net carrying value of repurchased debt |  |  | 6,715
Convertible Senior Debentures [Member] |  |  |
Interest expense [Abstract] |  |  |
Contractual coupon interest |  |  | 88
Non-cash amortization of debt discount |  |  | 43
Other Noncash Interest Expense (Income) |  |  | 0
Total interest expense related to the debentures |  |  | $ 131

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: 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)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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- Definition The portion of the repurchased convertible debt instrument allocated to equity. + References No definition available. + Details
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- Definition The portion of the repurchased convertible debt instrument allocated to liability. + References No definition available. + Details
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- Definition Committed and uncommitted short-term credit lines with various U.S. and foreign banks held by the Company. + References No definition available. + Details
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- Definition Maximum threshold of quarterly cash dividends per share of common stock for not adjusting conversion rate of convertible notes. + References No definition available. + Details
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- Definition Floor percentage of the trading price of convertible debt instruments to the product of common stock price and conversion rate to determine eligibility of conversion. + References No definition available. + Details
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- Definition Amount of adverse judgment triggering default on revolving credit facility + References No definition available. + Details
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- Definition The amount of incremental revolving commitments available for request under the Amended and Restated Credit Agreement. + References No definition available. + Details
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- Definition Minimum pro form leverage ratio required for unlimited investments under the revolving credit facility. + References No definition available. + Details
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- Definition Net carrying value of repurchased debt instruments. + References No definition available. + Details
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- Definition Amount of other noncash interest expense (income) incurred. + References No definition available. + Details
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- Definition Total limit of "restricted payments" allowed under the revolving credit facility. + References No definition available. + Details
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