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v3.20.4

Equity - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 644,729 |  |  |
Income tax expense |  | $ (185) | $ 630 |
Net other comprehensive income (loss) | (31,950) | 2,572 | (1,332) |
Transition adjustment related to adoption | 219,817 | 644,729 | 469,577 | $ 378,156
Ending balance | 205,301 | 644,729 |  |
AOCI Attributable to Parent [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (28,159) | (28,024) | (26,692) |
Gains (losses) arising during period | (42,859) | 4,232 | (2,231) |
Amounts reclassified from accumulated other comprehensive loss | 10,909 | (1,475) | 269 |
Income tax expense |  | (185) | 630 |
Net other comprehensive income (loss) | (31,950) | 2,572 | (1,332) |
Transition adjustment related to adoption | (57,951) | (28,159) | (28,024) | $ (26,692)
Ending balance | (57,951) | (28,159) | (28,024) |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (23,916) | (21,814) | (20,149) |
Gains (losses) arising during period | (2,901) | 693 | (2,231) |
Amounts reclassified from accumulated other comprehensive loss | 194 | 97 | (64) |
Income tax expense |  | (185) | 630 |
Net other comprehensive income (loss) | (2,707) | 605 | (1,665) |
Ending balance | (26,623) | (23,916) | (21,814) |
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (5,877) | (6,210) | (6,543) |
Amounts reclassified from accumulated other comprehensive loss | 210 | 333 | 333 |
Net other comprehensive income (loss) | 210 | 333 | 333 |
Ending balance | (3,509) | (5,877) | (6,210) |
Interest Rate Derivatives |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 1,634 |  |  |
Gains (losses) arising during period | (39,958) | 3,539 |  |
Amounts reclassified from accumulated other comprehensive loss | 10,505 | (1,905) |  |
Net other comprehensive income (loss) | (29,453) | 1,634 |  |
Ending balance | (27,819) | 1,634 |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Transition adjustment related to adoption | (3,185) |  | $ (134) |
Cumulative Effect, Period of Adoption, Adjustment [Member] | AOCI Attributable to Parent [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Transition adjustment related to adoption | 2,158 | (2,707) |  |
ASU 2018-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | AOCI Attributable to Parent [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Transition adjustment related to adoption |  | (2,707) |  |
ASU 2018-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Transition adjustment related to adoption |  | $ (2,707) |  |
ASU 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | AOCI Attributable to Parent [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Transition adjustment related to adoption | 2,158 |  |  |
ASU 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Transition adjustment related to adoption | $ 2,158 |  |  |

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