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Debt and Credit Agreements - Schedule of Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ (5,769) | $ (6,109)
Long-term debt, net | 1,522,231 | 1,521,891
Current maturities | 304,000 | 304,000
6.51% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Total debt | $ 361,000 | $ 361,000
Weighted average interest rate | 6.51% | 6.51%
Current maturities | $ 237,000 |
9.78% senior notes |  |
Debt Instrument [Line Items] |  |
Total debt | $ 67,000 | $ 67,000
Long-term debt, interest rate, stated percentage | 9.78% | 9.78%
Current maturities | $ 67,000 |
5.58% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Total debt | $ 175,000 | $ 175,000
Weighted average interest rate | 5.58% | 5.58%
3.65% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Total debt | $ 925,000 | $ 925,000
Weighted average interest rate | 3.65% | 3.65%
Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Total debt | $ 0 | $ 0

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6876686&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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