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Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - Fair Value Measurements Using Level 3 [Member] - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Amount [Member] |  |
Liabilities |  |
Carrying value of debt | $ 2,002,579 | $ 2,068,867
Carrying Amount [Member] | LCIF [Member] |  |
Liabilities |  |
Carrying value of debt | 360,657 | 370,581
Fair Value [Member] |  |
Liabilities |  |
Fair value of debt | 1,945,604 | 2,013,226
Fair Value [Member] | LCIF [Member] |  |
Liabilities |  |
Fair value of debt | $ 342,989 | $ 352,806

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 + Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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