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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 732,573 |
Total amount reclassified from Accumulated other comprehensive loss, net of tax | $ 0 | $ 0 | 720 | $ 15,359
Unrealized gain on available-for-sale securities (Note 16) | 124 | 27 | 62 | 563
Other comprehensive income (loss) | 7,883 | 1,020 | (11,304) | 19,299
Balance at end of period | 748,654 |  | 748,654 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (121,746) | (117,266) | (124,848) | (115,517)
Tax benefit | (1,079) | (1,384) | (2,146) | (2,050)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 3,090 | 1,378 | 6,192 | 3,401
Balance at end of period | (118,656) | (115,888) | (118,656) | (115,888)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent | Adjustments for New Accounting Pronouncement |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at end of period | 0 | (3,772) | 0 | (3,772)
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | 0 | 0 | 0
Tax benefit | 0 | 0 | 0 | 0
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 0 | 0 | 0 | 0
Balance at end of period | 0 | 0 | 0 | 0
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest | Adjustments for New Accounting Pronouncement |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at end of period | 0 | 0 | 0 | 0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from Accumulated other comprehensive loss | (52) | 11 | (104) | (94)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from Accumulated other comprehensive loss | 0 | 0 | 0 | 0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from Accumulated other comprehensive loss | 4,221 | 2,751 | 8,442 | 5,545
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from Accumulated other comprehensive loss | 0 | 0 | 0 | 0
Accumulated Net Investment Gain (Loss) Attributable to Parent |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (56) | (36) |  |
Unrealized gain on available-for-sale securities (Note 16) | 124 | 27 | 62 | 563
Other comprehensive income (loss) |  |  | 6 | (572)
Balance at end of period | 68 | (9) | 68 | (9)
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | 0 |  |
Unrealized gain on available-for-sale securities (Note 16) | 0 | 0 | 0 | 0
Other comprehensive income (loss) |  |  | 0 | 0
Balance at end of period | 0 | 0 | 0 | 0
Accumulated Foreign Currency Adjustment Attributable to Parent |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (111,273) | (87,261) | (18,181) | (30)
Total amount reclassified from Accumulated other comprehensive loss, net of tax |  |  | (720) | (15,359)
Other comprehensive income (loss) | 4,651 | (248) | (89,161) | (102,838)
Balance at end of period | (106,622) | (87,509) | (106,622) | (87,509)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 308 | 639 | (97) | 6
Total amount reclassified from Accumulated other comprehensive loss, net of tax |  |  | 0 | 0
Other comprehensive income (loss) | 18 | (137) | 423 | 496
Balance at end of period | $ 326 | $ 502 | $ 326 | $ 502

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