Consolidated Statements of Comprehensive Income - 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	$ 79,955	$ 92,512	$ 153,934	$ 147,699
Other comprehensive income, before tax:
Foreign currency translation adjustments	(471)	382	(457)	582
Recognition of previously deferred post-retirement benefit plan costs	1,437	1,302	2,862	2,552
Pension lump-sum payment charge	686	0	686	6,300
Other comprehensive income, before tax	1,652	1,684	3,091	9,434
Income tax effect related to components of other comprehensive income	(414)	(432)	(774)	(2,408)
Other comprehensive income, net of tax	1,238	1,252	2,317	7,026
Comprehensive income	$ 81,193	$ 93,764	$ 156,251	$ 154,725

Other comprehensive income (loss) pension and other postretirement benefit plans other adjustments before tax.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount, before tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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