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Fair Value Measurements - Fair Value, by Balance Sheet Grouping (Details) - Fair Value Measurements Using Level 3 [Member] - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Amount [Member] |  |
Liabilities |  |
Debt, Carrying Amount | $ 1,492,483 | $ 2,068,867
Fair Value [Member] |  |
Liabilities |  |
Debt, Fair Value | $ 1,409,773 | $ 2,013,226

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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Period Type: | instant

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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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- References No definition available. + Details
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- Details
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- Details
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- Details
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