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STATEMENTS OF COMPREHENSIVE INCOME STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 20,419	$ 20,623	$ 111,254	$ 97,079
Other comprehensive income (loss), net of tax
Change in pension and postemployment benefit plan liability, net of tax of $(68), $(81), (419) and (161), respectively	203	129	123	258
Other comprehensive income, net of tax	203	129	123	258
Comprehensive income	$ 20,622	$ 20,752	$ 111,377	$ 97,337

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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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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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