Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 73,979	$ 55,187
Other comprehensive income, before tax:
Foreign currency translation adjustments	14	202
Recognition of previously deferred post-retirement benefit plan costs	1,425	1,250
Pension lump-sum payment charge	0	6,300
Other comprehensive income, before tax	1,439	7,752
Income tax effect related to components of other comprehensive income	(360)	(1,977)
Other comprehensive income, net of tax	1,079	5,775
Comprehensive income	$ 75,058	$ 60,962

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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