Restatement of Previously Reported Consolidated Financial Statements - Restated Condensed Statements of Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]
Beginning balance	$ 787,259	$ 1,865,806
Comprehensive loss	(10,917)	28,210
Ending balance	750,920	1,865,844
Accumulated Other Comprehensive Income (Loss)
Statement of Stockholders' Equity [Abstract]
Beginning balance	(1,570)	25,834
Comprehensive loss	(1,405)	(8,787)
Ending balance	(2,975)	17,047
Accumulated Deficit
Statement of Stockholders' Equity [Abstract]
Beginning balance	(2,137,738)	(1,963,605)
Comprehensive loss	(1,819)	31,027
Ending balance	$ (2,152,609)	(1,942,918)
As Previously Reported
Statement of Stockholders' Equity [Abstract]
Beginning balance		1,953,045
Comprehensive loss		26,708
Ending balance		1,951,581
As Previously Reported | Accumulated Other Comprehensive Income (Loss)
Statement of Stockholders' Equity [Abstract]
Beginning balance		15,865
Comprehensive loss		(11,404)
Ending balance		4,461
As Previously Reported | Accumulated Deficit
Statement of Stockholders' Equity [Abstract]
Beginning balance		(1,866,397)
Comprehensive loss		32,142
Ending balance		(1,844,595)
Restatement Adjustments
Statement of Stockholders' Equity [Abstract]
Beginning balance		(87,239)
Comprehensive loss		1,502
Ending balance		(85,737)
Restatement Adjustments | Accumulated Other Comprehensive Income (Loss)
Statement of Stockholders' Equity [Abstract]
Beginning balance		9,969
Comprehensive loss		2,617
Ending balance		12,586
Restatement Adjustments | Accumulated Deficit
Statement of Stockholders' Equity [Abstract]
Beginning balance		(97,208)
Comprehensive loss		(1,115)
Ending balance		$ (98,323)