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Accumulated Other Comprehensive Income (Loss) - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains on investments |  |  |  |  |  |  |  |  |  | $ 319 | $ 1,165 | $ 658
Tax effect |  |  |  |  |  |  |  |  |  | (45,898) | (21,250) | (10,493)
Income from continuing operations |  | $ (21,814) | $ 44,758 | $ 27,438 | $ 7,593 | $ (4,136) | $ 34,013 | $ 19,873 | $ (6,797) | 58,452 | 43,479 | $ 27,442
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains on Investments |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains on investments |  |  |  |  |  |  |  |  |  | (100) | (97) |
Tax effect |  |  |  |  |  |  |  |  |  | 38 | 37 |
Income from continuing operations |  |  |  |  |  |  |  |  |  | (62) | (60) |
Reclassification out of Accumulated Other Comprehensive Income | Unrecognized Net Actuarial Loss and Prior Service Credit, Net |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recognized net actuarial (gain) loss | [1] |  |  |  |  |  |  |  |  | 507 | 1,440 |
Amortization of prior service credit | [1] |  |  |  |  |  |  |  |  | (1,247) | (575) |
Tax effect |  |  |  |  |  |  |  |  |  | 310 | (328) |
Income from continuing operations |  |  |  |  |  |  |  |  |  | $ (430) | $ 537 |
[1] | Amount included in pension expense. Refer to Note 17 – Pension and Postretirement Benefits

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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=84230637&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 + Details
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- Definition Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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