Voluntary Reorganization under Chapter 11 of the Bankruptcy Code - Chapter 11 (Details) - USD ($)			12 Months Ended
	Feb. 08, 2019	Dec. 28, 2017	Dec. 31, 2018	Nov. 06, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Post petition professional fees relating to Chapter 11 Cases			$ 3,800,000
Reorganization items related to adjustments to certain claims relating to Chapter 11 Cases			500,000
Liabilities Subject to Compromise [Abstract]
Accrued interest			20,624,000
Accounts payable to vendors			874,000
Other long-term liabilities			510,000
Other accrued liabilities			2,724,000
Preferred stock dividend payable			14,649,000
Liabilities subject to compromise			$ 323,854,000		$ 0
10% Senior Secured Notes due 2021
Restructuring Cost and Reserve [Line Items]
New shares issued (in shares)		2,200,000
10% Senior Secured Notes due 2021 | Restructuring Support Agreement
Restructuring Cost and Reserve [Line Items]
Debt instrument, ownership percentage				81.83%
Stated interest rate				10.00%
10% Senior Secured PIK Notes due 2021 | Restructuring Support Agreement
Restructuring Cost and Reserve [Line Items]
Debt instrument, ownership percentage				84.76%
Stated interest rate				10.00%
Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021
Restructuring Cost and Reserve [Line Items]
Stated interest rate			10.00%		10.00%
Liabilities Subject to Compromise [Abstract]
10% Senior Secured Notes			$ 275,046,000
Senior Notes | 10% Senior Secured Notes due 2021
Restructuring Cost and Reserve [Line Items]
Stated interest rate			10.00%		10.00%
Liabilities Subject to Compromise [Abstract]
10% Senior Secured Notes			$ 9,427,000
Subsequent Event | Payment in Kind (PIK) Note | 10% Secured PIK Notes due 2024
Restructuring Cost and Reserve [Line Items]
Stated interest rate	10.00%
Principal amount	$ 80,000,000
Subsequent Event | Payment in Kind (PIK) Note | Former Holders Of Old Notes | 10% Secured PIK Notes due 2024 | Cancellation And Discharge Of Old Notes
Restructuring Cost and Reserve [Line Items]
Principal amount	80,000,000
Term Loan | Subsequent Event | Line of Credit | Exit Facility
Restructuring Cost and Reserve [Line Items]
Maximum borrowing capacity	$ 50,000,000
Class A Common Stock | Common Stock | Subsequent Event | Commitment To Backstop Exit Facility
Restructuring Cost and Reserve [Line Items]
New shares issued (in shares)	300,000
Class A Common Stock | Common Stock | Subsequent Event | 2019 Long Term Incentive Plan
Restructuring Cost and Reserve [Line Items]
Number of shares reserved for issuance (in shares)	1,344,000
Class A Common Stock | Common Stock | Subsequent Event | Former Holders Of Old Notes | Cancellation And Discharge Of Old Notes
Restructuring Cost and Reserve [Line Items]
New shares issued (in shares)	8,900,000
Class B Common Stock | Common Stock | Subsequent Event | Class B Holder
Restructuring Cost and Reserve [Line Items]
New shares issued (in shares)	1
Class C Common Stock | Common Stock | Subsequent Event | Class C Holder
Restructuring Cost and Reserve [Line Items]
New shares issued (in shares)	1