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Organization and Summary of Significant Accounting Policies - Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Changes in accumulated other comprehensive income (loss) by component        
Beginning balance     $ 684,928 $ 787,259
Total other comprehensive income (loss) $ 419 $ (2,021) 1,859 (6,212)
Ending balance 679,854 756,092 679,854 756,092
Interest expense 22,504 21,177 43,925 41,477
Benefit from income taxes 1,580 4,500 1,257 7,834
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     173 (2,666)
Loss reclassified from accumulated other comprehensive loss, net of tax     569 655
Total other comprehensive income (loss)     742 (2,011)
Ending balance (936) (3,581) (936) (3,581)
Gain (loss) recognized in other comprehensive income (loss) related to change in fair value of derivative financial instruments before tax (100) (1,500) 200 (4,000)
Tax provision (benefit) of loss recognized in other comprehensive income (loss) related to change in fair value of derivative financial instruments (100) (500)   (1,300)
Gain (loss) recognized in other comprehensive income (loss), net of tax     173 (2,666)
Derivatives Cash Flow Hedges | Reclassification adjustments | Interest rate swaps        
Changes in accumulated other comprehensive income (loss) by component        
Interest expense 400 500 900 1,000
Benefit from income taxes $ 100 $ 200 $ 300 $ 400