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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 30,298	$ 21,341	$ 77,332	$ 52,016
Other comprehensive income (loss), net of taxes	(794)	(924)	(680)	(1,171)
Comprehensive income (loss)	$ 29,504	$ 20,417	$ 76,652	$ 50,845

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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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