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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

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