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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 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 $ (212) 720 $ 15,147
Unrealized (loss) gain on available-for-sale securities (Note 16) (74) (9) (12) 554
Other comprehensive income (loss) 18,504 (14,055) 7,200 5,244
Balance at end of period 780,103   780,103  
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 (118,656) (115,888) (124,848) (115,517)
Tax benefit (1,111) (468) (3,257) (2,518)
Total amount reclassified from Accumulated other comprehensive loss, net of tax 3,058 2,257 9,250 5,658
Balance at end of period (115,598) (113,631) (115,598) (113,631)
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) (47) (156) (141)
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 2,772 12,663 8,317
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 68 (9)    
Unrealized (loss) gain on available-for-sale securities (Note 16) (74) (9) (12) 554
Other comprehensive income (loss)     6 (572)
Balance at end of period (6) (18) (6) (18)
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 (loss) 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 (106,622) (87,509) (2,955) (15,894)
Total amount reclassified from Accumulated other comprehensive loss, net of tax 0 (212) (720) (15,147)
Other comprehensive income (loss) 15,226 (15,864) (89,161) (102,838)
Balance at end of period (91,396) (103,585) (91,396) (103,585)
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 326 502 197 (221)
Total amount reclassified from Accumulated other comprehensive loss, net of tax 0 0 0 0
Other comprehensive income (loss) 294 (227) 423 496
Balance at end of period $ 620 $ 275 $ 620 $ 275