Organization and Summary of Significant Accounting Policies - Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Changes in accumulated other comprehensive income (loss) by component
Beginning balance		$ 735,618		$ 735,618	$ 684,928
Merger-related adjustments	$ 5,670		$ 0	5,670	0
Total other comprehensive income	7,475		419	12,182	1,859
Ending balance	830,725		679,854	830,725	679,854
Interest expense	23,337		22,504	45,884	43,925
Benefit from income taxes	1,567		1,580	1,213	1,257
Adjustments related to TCJA		(300)
Adjustments to other comprehensive income (loss)				5,700
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component
Beginning balance		1,197		1,197	(1,678)
Merger-related adjustments				5,670
Ending balance	9,374		(936)	9,374	(936)
Accumulated Other Comprehensive Income (Loss) \| Reclassification adjustments
Changes in accumulated other comprehensive income (loss) by component
Interest expense	207			153
Derivatives Cash Flow Hedges
Changes in accumulated other comprehensive income (loss) by component
Beginning balance		$ 1,197		1,197	(1,678)
Gain recognized in other comprehensive loss, net of tax				2,051	173
Loss reclassified from accumulated other comprehensive loss, net of tax				456	569
Merger-related adjustments				5,670
Total other comprehensive income				8,177	742
Ending balance	9,374		(936)	9,374	(936)
Gain (loss) recognized in other comprehensive income (loss) related to change in fair value of derivative financial instruments before tax	900		(100)	2,900	200
Tax provision (benefit) of loss recognized in other comprehensive income (loss) related to change in fair value of derivative financial instruments	500		(100)	900
Adjustments related to TCJA				(300)
Derivatives Cash Flow Hedges \| Reclassification adjustments \| Interest rate swaps
Changes in accumulated other comprehensive income (loss) by component
Interest expense	0		400	300	900
Benefit from income taxes	$ 0		$ 100	$ 100	$ 300

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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