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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, 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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