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Shareholders' Equity Accumulated OCI Reclassified to Statement of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |  | $ (58) | $ (59) | $ (138)
Other Amounts Recognized in Other Comprehensive Income, before tax |  | (4) | 46 | (68)
Income (loss) before income taxes |  | 84,627 | 37,102 | (18,265)
Income Tax Expense (Benefit) |  | (49,574) | (22,099) | (4,035)
Net income (loss) |  | 35,053 | 15,003 | (22,300)
Total reclassifications for the period, net of tax |  | 35,053 | 15,003 | (22,300)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1],[2] | (58) | (59) | (138)
Defined Benefit Plan, Amortization of Gains (Losses) | [1],[2] | (1,351) | (1,979) | (572)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements | [1],[2] | (1,343) | (375) | (55)
Other Amounts Recognized in Other Comprehensive Income, before tax | [1],[2] | 0 | (46) | 0
Income (loss) before income taxes | [1] | (2,752) | (2,459) | (765)
Income Tax Expense (Benefit) | [1] | 29 | 733 | 10
Net income (loss) | [1] | (2,723) | (1,726) | (755)
Total reclassifications for the period, net of tax | [1] | $ (2,723) | $ (1,726) | $ (755)
[1] | Amounts in parenthesis indicate debits to the Consolidated Statements of Operations.
[2] | These AOCI components are included in the computation of net periodic pension cost. Refer to Note 8 for additional details.

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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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