Subsequent Events-Voluntary Petition Under Chapter 11 of the Bankruptcy Code (Details) - Sep. 08, 2015 - Subsequent Event - USD ($)	Total
Subsequent Event [Line Items]
Significant debt holders in agreement with plan sponsor agreement	73.00%
Liabilities subject to compromise	$ 500,000,000
Payments for consideration of extinguishment	7,500,000
Debtor-in-possession financing, amount arranged	175,000,000.0
Amount arrangement available upon entry of the interim order	98,000,000
2018 Notes - 7.875% Fixed
Subsequent Event [Line Items]
Principal amount	280,000,000
2020 Notes - 10.000% Fixed
Subsequent Event [Line Items]
Principal amount	225,000,000
Revolving Credit Facility
Subsequent Event [Line Items]
Debtor-in-possession financing, amount arranged	60,000,000.0
Delayed Draw Term Loan
Subsequent Event [Line Items]
Debtor-in-possession financing, amount arranged	115,000,000.0
Amount arrangement available upon entry of the interim order	$ 70,000,000