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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at December 31, 2017 |  |  | $ 786,760 |
Other comprehensive income (loss) before reclassifications |  |  | 3,664 |
Amounts reclassified out of accumulated other comprehensive income (loss) |  |  | 121 |
Other comprehensive income (loss) | $ 871 | $ 26 | 3,785 | $ 1,329
Balance at June 30, 2018 | 786,980 |  | 786,980 |
Other comprehensive income (loss) before reclassifications, tax expense |  |  | 1,373 |
Amounts reclassified out of accumulated other comprehensive income (loss), tax expense |  |  | 45 |
Gains and Losses on Cash Flow Hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at December 31, 2017 |  |  | 1,750 |
Other comprehensive income (loss) before reclassifications |  |  | 3,664 |
Amounts reclassified out of accumulated other comprehensive income (loss) |  |  | 121 |
Other comprehensive income (loss) |  |  | 3,785 |
Balance at June 30, 2018 | 5,535 |  | 5,535 |
Defined Benefit Pension Plan |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at December 31, 2017 |  |  | (443) |
Other comprehensive income (loss) before reclassifications |  |  | 0 |
Amounts reclassified out of accumulated other comprehensive income (loss) |  |  | 0 |
Other comprehensive income (loss) |  |  | 0 |
Balance at June 30, 2018 | (443) |  | (443) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at December 31, 2017 |  |  | 1,307 |
Other comprehensive income (loss) |  |  | 3,785 |
Balance at June 30, 2018 | $ 5,092 |  | $ 5,092 |

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