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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 809,891 |
Total amount reclassified from accumulated other comprehensive loss, net of tax, into net income | $ 0 | $ 0 | 0 | $ 720
Unrealized (loss) gain on available-for-sale securities (Note 16) | 1 | 124 | (4) | 62
Foreign currency translation adjustments | 9,676 | 7,883 | 3,160 | (11,304)
Balance at end of period | 848,768 |  | 848,768 |
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 | (111,840) | (121,746) | (115,552) | (124,848)
Tax benefit | (1,139) | (1,079) | (2,223) | (2,146)
Total amount reclassified from accumulated other comprehensive loss, net of tax, into net income | 3,657 | 3,090 | 7,369 | 6,192
Balance at end of period | (108,183) | (118,656) | (108,183) | (118,656)
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, into net income | 0 | 0 | 0 | 0
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 | (24) | (52) | (48) | (104)
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 | 4,820 | 4,221 | 9,640 | 8,442
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 | (6) | (56) | (1) | 6
Unrealized (loss) gain on available-for-sale securities (Note 16) | 1 | 124 | (4) | 62
Balance at end of period | (5) | 68 | (5) | 68
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 | 0 | 0
Unrealized (loss) gain on available-for-sale securities (Note 16) | 0 | 0 | 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 | (77,102) | (111,273) | (66,844) | (89,161)
Total amount reclassified from accumulated other comprehensive loss, net of tax, into net income |  |  | 0 | 720
Foreign currency translation adjustments | 6,145 | 4,651 | (4,113) | (18,181)
Balance at end of period | (70,957) | (106,622) | (70,957) | (106,622)
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 | 617 | 308 | 582 | 423
Total amount reclassified from accumulated other comprehensive loss, net of tax, into net income |  |  | 0 | 0
Foreign currency translation adjustments | (127) | 18 | (92) | (97)
Balance at end of period | $ 490 | $ 326 | $ 490 | $ 326

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