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Fair Value of Financial Instruments Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Total long-term debt, excluding debt issuance costs | $ 1,483,794 | $ 1,845,309
Total long-term debt, fair value, excluding debt issuance costs | $ 1,553,114 | $ 1,949,638

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- Definition Debt Instrument, Carrying Amount, Excluding Debt Issuance Costs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Balance Type: | credit
Period Type: | instant

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