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Organization and Summary of Significant Accounting Policies - Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in accumulated other comprehensive income (loss) by component
Beginning balance			$ 684,928	$ 787,259
Total other comprehensive income (loss)	$ 2,290	$ 2,762	4,149	(3,450)
Ending balance	701,450	753,535	701,450	753,535
Interest expense	22,892	21,365	66,817	62,842
Benefit from income taxes	4,795	4,878	6,052	12,712
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component
Beginning balance			(1,678)	(1,570)
Ending balance	195	(2,708)	195	(2,708)
Derivatives Cash Flow Hedges
Changes in accumulated other comprehensive income (loss) by component
Beginning balance			(1,678)	(1,570)
Loss recognized in other comprehensive loss, net of tax			1,104	(2,132)
Loss reclassified from accumulated other comprehensive loss, net of tax			769	994
Total other comprehensive income (loss)			1,873	(1,138)
Ending balance	195	(2,708)	195	(2,708)
Gain (loss) recognized in other comprehensive income (loss) related to change in fair value of derivative financial instruments before tax	1,200	900	1,400	(3,100)
Tax provision (benefit) of loss recognized in other comprehensive income (loss) related to change in fair value of derivative financial instruments	300	300	300	(1,000)
Derivatives Cash Flow Hedges | Reclassification adjustments | Interest rate swaps
Changes in accumulated other comprehensive income (loss) by component
Interest expense	300	500	1,200	1,500
Benefit from income taxes	$ 100	$ 100	$ 400	$ 500

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