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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 27,718 | $ 41,825 | $ 39,107 | $ 78,875
Defined benefit pension plans |  |  |  |
Actuarial gain, net of tax of $-, $3,383, $- and $3,383, respectively | 0 | 9,957 | 0 | 9,957
Amortization of actuarial (gain) loss, net of tax of ($11), $90, ($22) and $298, respectively | (33) | 266 | (65) | 879
Effect of settlements, net of tax of $-, $3,044, $-, and $3,044, respectively | 0 | 8,959 | 0 | 8,959
Other comprehensive income (loss), net of tax | (33) | 19,182 | (65) | 19,795
Comprehensive income | $ 27,685 | $ 61,007 | $ 39,042 | $ 98,670

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- Definition Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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