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Debt and Credit Agreements - Schedule of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ (4,896) | $ (6,109)
Long-term debt | 1,226,104 | 1,521,891
Current portion of long-term debt | $ 0 | $ 304,000
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 | $ 124,000 | $ 361,000
Current portion of long-term debt | $ 237,000 |
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 | $ 0 | $ 67,000
Current portion of long-term debt | $ 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 | $ 7,000 | $ 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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=6877327&loc=d3e13212-122682 Reference 4: 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=6876686&loc=d3e534808-122878 + Details
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