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Accumulated Other Comprehensive Loss (Schedule of Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Income (loss) before income taxes |  | $ (3,639) | $ 5,005 | $ 23,225 | $ (19,630)
Income tax provision (benefit) |  | 1,764 | (2,389) | (5,668) | (7,505)
Net income (loss) |  | (1,875) | 2,616 | 17,557 | (27,135)
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net income (loss) | [1] | (114) | (142) | (378) | (142)
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) | Defined Benefit Plan Items |  |  |  |  |
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of prior-service cost | [2] | (228) | (227) | (684) | (227)
Income (loss) before income taxes |  | (228) | (227) | (684) | (227)
Income tax provision (benefit) |  | 60 | 85 | 180 | 85
Net income (loss) |  | (168) | $ (142) | (504) | $ (142)
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) | Cash Flow Hedges |  |  |  |  |
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Interest payments | [3] | 73 |  | 171 |
Income (loss) before income taxes |  | 73 |  | 171 |
Income tax provision (benefit) |  | (19) |  | (45) |
Net income (loss) |  | $ 54 |  | $ 126 |
[1] | Amounts in parentheses indicate credits to profit/loss
[2] | This accumulated other comprehensive loss component is included in the computation of net periodic benefit cost (see Note 6).
[3] |

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: 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(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: 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(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: 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(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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