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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