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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 37,050	$ 10,020
Defined benefit pension plans
Amortization of actuarial loss, net of tax of $208 and $152, respectively	613	243
Other comprehensive income, net of tax	613	243
Comprehensive income	$ 37,663	$ 10,263

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- Definition

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.

+ References

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-Topic 220
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-Section 45
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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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