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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) |

X
- 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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