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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from accumulated other comprehensive income		$ 0	$ (5,082)	$ 0	$ (5,082)
Restricted cash		$ 108,704	$ 13,776	108,704	13,776
Net cash provided by operating activities				$ (179,124)	(211,497)
AOCI Attributable to Parent | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect from other comprehensive income to retained earnings	$ (86,572)
Reclassification from accumulated other comprehensive income	(841)
Retained Earnings | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect from other comprehensive income to retained earnings	86,572
Reclassification from accumulated other comprehensive income	$ 841
Restatement Adjustment | Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities					$ 9,947

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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