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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 2,300 | $ 22,000 | $ 20,200 | $ 7,600 | $ 15,700 | $ 32,300 | $ 26,400 | $ 5,600 | $ 52,182 | $ 80,009 | $ 116,936
Defined benefit pension plans |  |  |  |  |  |  |  |  |  |  |
Actuarial gain (loss), net of tax of $3,235, ($28,782), and $37,071, respectively |  |  |  |  |  |  |  |  | 5,171 | (46,234) | 60,100
Amortization of actuarial (gain) loss, net of tax of $1,880, ($8), and $3,510, respectively |  |  |  |  |  |  |  |  | 3,004 | (15) | 5,692
Effects of settlements, net of tax of $193, $0, and $0, respectively |  |  |  |  |  |  |  |  | 308 | 0 | 0
Amortization of prior service costs and other, net of tax of $0, $0, and $116, respectively |  |  |  |  |  |  |  |  | 0 | 0 | 188
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 8,483 | (46,249) | 65,980
Comprehensive income |  |  |  |  |  |  |  |  | $ 60,665 | $ 33,760 | $ 182,916

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- Definition Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, 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 (i) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: 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=36458714&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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