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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 9,964	$ 26,882	$ 70,539	$ 85,756
Other comprehensive income (loss), net of taxes	251	(491)	4,201	5,631
Comprehensive income	$ 10,215	$ 26,391	$ 74,740	$ 91,387

X

- 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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-Publisher FASB
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-Section 45
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- Definition

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

+ References

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

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