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Derivative Instruments - Realized and Unrealized Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Details) - Derivatives not designated as hedging instruments: - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative [Line Items]
Unrealized (Loss) Gain	$ (28,506)	$ 27,119	$ (37,679)	$ 39,386
Realized Gain (Loss)	140,102	(149)	129,935	(269)
Total Gain (Loss)	111,596	26,970	92,256	39,117
Contingent redemption features - Series A Preferred Stock
Derivative [Line Items]
Unrealized (Loss) Gain	(28,607)	27,219	(42,140)	39,442
Realized Gain (Loss)	140,319	0	140,319	0
Total Gain (Loss)	111,712	27,219	98,179	39,442
Cross currency and interest rate swaps
Derivative [Line Items]
Unrealized (Loss) Gain	53	(145)	4,358	(127)
Realized Gain (Loss)	(217)	(149)	(10,384)	(269)
Total Gain (Loss)	(164)	(294)	(6,026)	(396)
Interest rate swaps
Derivative [Line Items]
Unrealized (Loss) Gain	48	45	103	71
Total Gain (Loss)	$ 48	$ 45	$ 103	$ 71

X

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-Section S99
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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