Supplemental Cash Flow Information - Supplemental Cash Flow Information (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Line Items]
Cash paid, interest capitalized	$ 0	$ 0	$ 520
11.00% 1.5 Lien Term Loan, Due November 2019
Supplemental Cash Flow Elements [Line Items]
Debt instrument interest rate	11.00%	11.00%
9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020
Supplemental Cash Flow Elements [Line Items]
Debt instrument interest rate	9.00%	9.00%
Debt instrument paid in kind interest rate	10.75%	10.75%
8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021
Supplemental Cash Flow Elements [Line Items]
Debt instrument interest rate	8.50%	8.50%
Debt instrument paid in kind interest rate	10.00%	10.00%
8.50% Unsecured Senior Notes, Due June 2019
Supplemental Cash Flow Elements [Line Items]
Debt instrument interest rate	8.50%	8.50%