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Long-Term Debt (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instruments [Abstract] |  |  |
Credit facility | $ 0 | $ 0 |
Deferred financing costs | (9,678) | (11,512) |
Long-term debt | 455,666 | 394,886 |
Less current portion | 0 | 0 |
Long-term debt, less current portion | 455,666 | 394,886 |
Purchase price of extinguished debt |  |  | $ 27,863
Allocated liability component of repurchased debt |  |  | 9,568
Allocated equity component of repurchased debt |  |  | 18,295
Loss on early extinguishment of debt | 0 | 8,073 | 2,030
Interest expense [Abstract] |  |  |
Contractual coupon interest |  | 12,185 | 13,998
Non-cash amortization of debt discount | 0 | 13,161 | 14,146
Other Noncash Interest Expense (Income) |  | 1,623 | 1,781
Total interest expense related to the debentures |  | 26,969 | 29,925
Principal amount of repurchased debt |  | 151,546 | 19,366
Committed and uncommitted short-term credit lines | 1,000 | 6,000 |
Aggregate annual maturities of long-term debt [Abstract] |  |  |
Interest paid | 14,177 | 15,450 | 16,177
Convertible Debt [Member] |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |
Principal amount of the convertible debt |  | 465,644 |
Unamortized discount |  | (59,246) |
Carrying value of liability component |  | 406,398 |
Equity component (including temporary equity) - net carrying value |  | 66,248 |
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 | 2.50 |  |
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 | 748,931 | 748,690 |
Letters of credit outstanding | 1,069 | 1,310 |
Convertible Senior Notes, Due 2025 [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Convertible debt | $ 465,344 | 406,268 |
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 | 31.9492 |  |
Effective conversion price (in dollars per share) | $ 31.30 |  |
130% of the conversion price (in dollars per share) | $ 40.69 |  |
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 | 465,344 |
Unamortized discount |  | (59,076) |
Carrying value of liability component |  | 406,268 |
Equity component (including temporary equity) - net carrying value |  | 66,127 |
Interest expense [Abstract] |  |  |
Contractual coupon interest | 10,470 | 12,097 | 13,500
Non-cash amortization of debt discount | 0 | 13,118 | 13,925
Other Noncash Interest Expense (Income) | 1,733 | 1,623 | 1,816
Total interest expense related to the debentures | 12,203 | 26,838 | 29,241
Principal amount of repurchased debt |  | 134,656 |
Net carrying value of repurchased debt |  | 115,978 |
Convertible Senior Debentures, Due 2040 [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Convertible debt | $ 0 | 130 |
Interest expense [Abstract] |  |  |
Principal amount of repurchased debt |  |  | 1,010
Net carrying value of repurchased debt |  |  | 417
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 | 16,188
Net carrying value of repurchased debt |  | 6,715 | 6,282
Convertible Senior Debentures 2042 [Member] |  |  |
Interest expense [Abstract] |  |  |
Principal amount of repurchased debt |  |  | 2,168
Net carrying value of repurchased debt |  |  | 924
Convertible Senior Debentures [Member] |  |  |
Interest expense [Abstract] |  |  |
Contractual coupon interest |  | 88 | 498
Non-cash amortization of debt discount |  | 43 | 221
Other Noncash Interest Expense (Income) |  | 0 | (35)
Total interest expense related to the debentures |  | 131 | $ 684
Convertible Senior Debentures [Member] | Convertible Debt [Member] |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |
Principal amount of the convertible debt |  | 300 |
Unamortized discount |  | (170) |
Carrying value of liability component |  | 130 |
Equity component (including temporary equity) - net carrying value |  | $ 121 |

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- Definition Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69E -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69F -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495745-112612 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph 8 -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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- Definition Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4297-108586 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Date the credit facility terminates, in YYYY-MM-DD format. + 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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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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 http://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. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 http://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 http://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 http://asc.fasb.org/extlink&oid=120400017&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 http://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 http://asc.fasb.org/extlink&oid=120398452&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 http://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 http://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 http://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 noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. 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 210.5-02.22) -URI http://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 http://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 http://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 http://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 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 Total limit of "restricted payments" allowed under the revolving credit facility. + References No definition available. + Details
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