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Debt and Credit Agreements - Schedule of debt (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Debt Instrument [Line Items] |  |
Long-term debt including unamortized debt issuance costs | $ 1,528,000 | $ 2,025,000
Unamortized debt issuance costs | (7,470) | (8,861)
Long-term debt | 1,520,530 | 2,016,139
Current maturities | $ 0 | $ (20,000)
7.33% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 7.33% | 7.33%
Long-term debt including unamortized debt issuance costs | $ 0 | $ 20,000
6.51% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 6.51% | 6.51%
Long-term debt including unamortized debt issuance costs | $ 361,000 | $ 425,000
9.78% senior notes |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 9.78% | 9.78%
Long-term debt including unamortized debt issuance costs | $ 67,000 | $ 67,000
5.58% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 5.58% | 5.58%
Long-term debt including unamortized debt issuance costs | $ 175,000 | $ 175,000
3.65% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 3.65% | 3.65%
Long-term debt including unamortized debt issuance costs | $ 925,000 | $ 925,000
Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Long-term debt including unamortized debt issuance costs | $ 0 | $ 413,000

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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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