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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Statement of Income Captions [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (33,502)	$ (96,458)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	3,502	(2,484)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(9,814)
Other Comprehensive Income (Loss), Net of Tax	3,502	(12,298)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(30,000)	(108,756)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	5,452	1,114
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	(33,502)	(43,291)
Net Income (Loss) Attributable to Noncontrolling Interest	5,464	1,114
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(35,452)	(109,870)
Consolidation, Eliminations [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	8,486	66,215
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(3,502)	2,484
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		9,814
Other Comprehensive Income (Loss), Net of Tax	(3,502)	12,298
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	4,984	78,513
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	5,452	1,114
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	8,486	66,215
Net Income (Loss) Attributable to Noncontrolling Interest	5,464	1,114
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (468)	$ 77,399

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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