Going Concern (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Oct. 26, 2016	Oct. 25, 2016	Feb. 26, 2016	Feb. 25, 2016
Debt Instrument [Line Items]
Net loss	$ 92,097,000	$ 105,642,000	$ 265,319,000	$ 186,561,000	$ 241,700,000
Asset-based revolving credit facility
Debt Instrument [Line Items]
Revolving credit facility, borrowing capacity								$ 100,000,000.0	$ 250,000,000
Subsequent Event
Debt Instrument [Line Items]
Debtor-in-possession financing, committed amount							$ 90,000,000.0
Debtor-in-possession financing, borrowings outstanding						$ 30,000,000