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Derivative Instruments - Summary of Unrealized Gain (Loss) Recorded In and Reclassified From Accumulated Other Comprehensive Income (Details) - Derivatives designated as hedging instruments: - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Comprehensive Income (Effective Portion) | $ 9,875 | $ 8,032 | $ 5,629
Loss Reclassified from AOCI to Income (Effective Portion) | (7,584) | (10,660) | (10,660)
Interest rate swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Comprehensive Income (Effective Portion) | 11,264 | 8,032 | 5,629
Interest rate swaps | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Loss Reclassified from AOCI to Income (Effective Portion) | (7,584) | (10,660) | (10,660)
Net investment cross currency swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Comprehensive Income (Effective Portion) | (1,389) | 0 | 0
Loss Reclassified from AOCI to Income (Effective Portion) | $ 0 | $ 0 | $ 0

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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