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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 786,760 |
Other comprehensive income (loss) before reclassifications |  |  | 4,140 |
Amounts reclassified out of accumulated other comprehensive income (loss) |  |  | 33 |
Other comprehensive income (loss) | $ 388 | $ 463 | 4,173 | $ 1,792
Ending balance | 803,844 |  | 803,844 |
Other comprehensive income (loss) before reclassifications, tax expense |  |  | 1,551 |
Amounts reclassified out of accumulated other comprehensive income (loss), tax expense |  |  | 12 |
Gains and Losses on Cash Flow Hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | 1,750 |
Other comprehensive income (loss) before reclassifications |  |  | 4,140 |
Amounts reclassified out of accumulated other comprehensive income (loss) |  |  | 33 |
Other comprehensive income (loss) |  |  | 4,173 |
Ending balance | 5,923 |  | 5,923 |
Defined Benefit Pension Plan |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | (443) |
Other comprehensive income (loss) before reclassifications |  |  | 0 |
Amounts reclassified out of accumulated other comprehensive income (loss) |  |  | 0 |
Other comprehensive income (loss) |  |  | 0 |
Ending balance | (443) |  | (443) |
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | 1,307 |
Other comprehensive income (loss) |  |  | 4,173 |
Ending balance | $ 5,480 |  | $ 5,480 |

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