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Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Mar. 25, 2016	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Data [Abstract]
Revenues		$ 79,241	$ 72,025	$ 118,672	$ 139,536	$ 135,523	$ 113,461	$ 126,157	$ 148,590	$ 409,474	$ 523,731	$ 772,854
Gross Profit		(4,049)	(7,838)	5,328	9,890	6,726	9,489	8,077	15,887	3,331	40,179	82,661
Net income (loss)		$ (11,138)	$ (11,614)	$ (448)	$ 638	$ 74	51	$ (468)	$ 12,667	$ (22,562)	$ 12,324	$ 31,805
Net income (loss) per common share- basic		$ (0.90)	$ (0.94)	$ (0.04)	$ 0.05	$ 0.01		$ (0.04)	$ 1.03	$ (1.82)	$ 1.00	$ 2.59
Net income (loss) per common share - diluted		$ (0.90)	$ (0.94)	$ (0.04)	$ 0.05	$ 0.01		$ (0.04)	$ 1.03	$ (1.82)	$ 1.00	$ 2.58
Restructuring and impairment charges					$ 1,777	$ 730	$ 1,531			$ 2,212	$ 2,261
Contingent liability charges		$ 1,450	$ 2,850
Decrease in net deferred tax assets		$ 2,502								$ (2,502)
Pre-tax gain on settlement of a postretirement benefit plan obligation, net of plaintiffs' attorneys' fees	$ 14,306								$ 14,306		$ (14,306)

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- Definition

Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. This item is reported net of plaintiffs' attorneys' fees.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation. Amounts are not net of cash paid.

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