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Derivatives - Effect in the Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Derivative financial instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income		$ (15,012)	$ 2,351
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings	[1]	(7)	(9)
Derivatives Designated in Hedging Relationships | Earnings from equity method investments | Interest rate swaps
Derivative financial instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income		(7,190)	2,351
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings		144	$ (9)
Derivatives Designated in Hedging Relationships | Interest expense | Interest rate swaps
Derivative financial instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income		(7,822)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings		$ (151)
[1] Amount reclassified to "Interest expense" in the Company's consolidated statements of operations is $151 for the three months ended March 31, 2019. Amounts reclassified to "Earnings (losses) from equity method investments" in the Company's consolidated statements of operations are $(144) and $9 for the three months ended March 31, 2019 and 2018, respectively.

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Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

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