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v3.20.4

Long-Term Debt (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) d $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instruments [Abstract] |  |  |
Credit facility | $ 0 | $ 0 |
Deferred financing costs | (11,512) | (16,784) |
Long-term debt | 394,886 | 499,147 |
Less current portion | 0 | 0 |
Long-term debt, less current portion | 394,886 | 499,147 |
Purchase price of extinguished debt |  |  | $ 960,995
Allocated liability component of repurchased debt |  | 9,568 | 241,706
Allocated equity component of repurchased debt |  | 18,295 | 719,289
Loss on early extinguishment of debt | 8,073 | 2,030 | 26,583
Interest expense [Abstract] |  |  |
Contractual coupon interest | 12,185 | 13,998 | 16,090
Non-cash amortization of debt discount | 13,161 | 14,146 | 10,769
Other Noncash Interest Expense (Income) | 1,623 | 1,781 | 1,313
Total interest expense related to the debentures | 26,969 | 29,925 | 28,172
Principal amount of repurchased debt | 151,546 | 19,366 | 538,444
Committed and uncommitted short-term credit lines | 6,000 | 6,000 |
Aggregate annual maturities of long-term debt [Abstract] |  |  |
Interest paid | 15,450 | 16,177 | 23,859
Convertible Debt [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Loss on early extinguishment of debt |  |  | 26,583
Liability and equity components of convertible debentures [Abstract] |  |  |
Principal amount of the convertible debt | 465,644 | 617,190 |
Unamortized discount | (59,246) | (101,259) |
Carrying value of liability component | 406,398 | 515,931 |
Equity component (including temporary equity) - net carrying value | $ 66,248 | 92,391 |
Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Line of credit facility, initiation date | Jun. 05, 2019 |  |
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 | 748,690 | 747,912 |
Letters of credit outstanding | 1,310 | 2,088 |
Previous Credit Facility [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Line of credit facility, maximum borrowing capacity | 640,000 |  |
Convertible Senior Notes, Due 2025 [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Convertible debt | $ 406,268 | 509,128 |
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 | 31.8836 |  |
Effective conversion price (in dollars per share) | $ / shares | $ 31.36 |  |
130% of the conversion price (in dollars per share) | $ / shares | $ 40.77 |  |
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) | $ / shares | $ 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 | 600,000 |
Unamortized discount | (59,076) | (90,872) |
Carrying value of liability component | 406,268 | 509,128 |
Equity component (including temporary equity) - net carrying value | 66,127 | 85,262 |
Interest expense [Abstract] |  |  |
Contractual coupon interest | 12,097 | 13,500 | 7,463
Non-cash amortization of debt discount | 13,118 | 13,925 | 7,240
Other Noncash Interest Expense (Income) | 1,623 | 1,816 | 1,059
Total interest expense related to the debentures | 26,838 | 29,241 | 15,762
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 | $ 130 | 126 |
Issuance date | Nov. 09, 2010 |  |
Maturity date | Nov. 15, 2040 |  |
Cash coupon rate | 2.25% |  |
Nonconvertible debt borrowing rate at issuance | 8.00% |  |
Effective conversion rate | 81.8143 |  |
Effective conversion price (in dollars per share) | $ / shares | $ 12.22 |  |
130% of the conversion price (in dollars per share) | $ / shares | $ 15.89 |  |
Call date | Nov. 20, 2020 |  |
Conversion period before maturity date | 3 months |  |
Debt instrument percentage of conversion price | 130.00% |  |
Debt instrument, percentage of sale price of common stock | 98.00% |  |
Percentage of redemption price to principal amount | 100.00% |  |
Threshold percentage of stock price trigger | 150.00% |  |
Trading period to trigger conversion, minimum | d | 20 |  |
Consecutive trading period prior to notice of redemption | d | 30 |  |
Liability and equity components of convertible debentures [Abstract] |  |  |
Principal amount of the convertible debt | $ 300 |  |
Debt Instrument, Period to accrue contingent interest subsequent to debt issuance | 10 years |  |
Interest expense [Abstract] |  |  |
Principal amount of repurchased debt |  | 1,010 | 273,690
Net carrying value of repurchased debt |  | 417 | 111,294
Convertible Senior Debentures, Due 2041 [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Convertible debt | $ 0 | 6,677 |
Conversion period before maturity date | 3 months |  |
Debt instrument percentage of conversion price | 130.00% |  |
Debt instrument, percentage of sale price of common stock | 98.00% |  |
Percentage of redemption price to principal amount | 100.00% |  |
Threshold percentage of stock price trigger | 150.00% |  |
Trading period to trigger conversion, minimum | d | 20 |  |
Consecutive trading period prior to notice of redemption | d | 30 |  |
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 | 116,922
Net carrying value of repurchased debt | 6,715 | 6,282 | 45,157
Convertible Senior Debentures 2042 [Member] |  |  |
Interest expense [Abstract] |  |  |
Principal amount of repurchased debt |  | 2,168 | 147,832
Net carrying value of repurchased debt |  | 924 | 62,503
Convertible Senior Debentures [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Purchase price of extinguished debt |  | 27,863 |
Interest expense [Abstract] |  |  |
Contractual coupon interest | 88 | 498 | 8,627
Non-cash amortization of debt discount | 43 | 221 | 3,529
Other Noncash Interest Expense (Income) | 0 | (35) | 254
Total interest expense related to the debentures | 131 | 684 | $ 12,410
Convertible Senior Debentures [Member] | Convertible Debt [Member] |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |
Principal amount of the convertible debt | 300 | 17,190 |
Unamortized discount | (170) | (10,387) |
Carrying value of liability component | 130 | 6,803 |
Equity component (including temporary equity) - net carrying value | $ 121 | $ 7,129 |

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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=121583591&loc=d3e4297-108586 + 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, 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=120520924&loc=SL6031897-161870 Reference 2: 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 3: 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 4: 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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