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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income and Comprehensive Income [Abstract]
Net income (loss)	$ 43,840	$ (48,686)	$ 47,474	$ (81,197)
Other comprehensive income (loss):
Pension adjustment and reclassification adjustment, net of taxes	135	127	270	254
Foreign currency translation	189	164	231	856
Unrealized loss on securities, net of taxes	(6)		(21)	(9)
Comprehensive income (loss)	$ 44,158	$ (48,395)	$ 47,954	$ (80,096)

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

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