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Liquidity and Ability to Continue as a Going Concern (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 17, 2020	Sep. 26, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Conditions that raised substantial doubt about going concern	This conclusion is based on the following principal conditions which are explained in further detail below.•Inability to meet anticipated commitments due to recurring losses, negative working capital and limited access to liquidity.•A forecasted covenant violation of the Unit credit agreement for the quarter ending June 30, 2020.•The expected acceleration of the amounts outstanding under the Unit credit agreement from October 18, 2023 to November 16, 2020.
Cash and cash equivalents	$ 571			$ 6,452	$ 701	$ 893
Unit credit agreement with an average interest rate of 4.0% at December 31, 2019	108,200			0
Aggregate principal amount	$ 650,000			650,000
Substantial Doubt about Going Concern, Management's Evaluation	Based on our evaluation of the conditions described above, substantial doubt exists about our ability to continue as a going concern. The consolidated financial statements do not reflect any adjustments that might result if we are unable to continue as a going concern.
Management's plans to alleviate the substantial doubt about going concern	In order to alleviate the conditions that give rise to substantial doubt about our ability to continue as a going concern, the company is currently undertaking a number of actions, including (i) minimizing capital expenditures, (ii) aggressively managing working capital, (iii) further reducing recurring operating expenses, (iv) exploring potential business transactions, and (v) negotiating with existing debt holders to restructure existing debts. We believe that even after taking these actions, we will not have sufficient liquidity to satisfy our debt service obligations, meet other financial obligations, and comply with our debt covenants. We have engaged financial and legal advisors to, among other things, assist with analyzing various strategic alternatives, to include a potential reorganization under Chapter 11, to address our liquidity and capital structure. However, there can be no assurance that we will be able to restructure our financial obligations on terms acceptable to the company and our creditors, and there can be no assurance that we will generate the necessary liquidity to satisfy these obligations when they come due.
Unit Credit Agreement [Member]
Unit credit agreement with an average interest rate of 4.0% at December 31, 2019	$ 108,200			0
Unit Credit Agreement [Member] \| Line Of Credit Facility Commitment Amount
Credit facility current credit amount			$ 275,000	$ 425,000
Unit Credit Agreement [Member] \| Line Of Credit Facility Commitment Amount \| Subsequent Event
Credit facility current credit amount		$ 200,000