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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ 450,555,000 $ 450,555,000 $ 442,937,000
Adoption of ASU 0    
Ending Balance   547,229,000 450,555,000
Unrealized Gains on Investments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance     616,000
Unrealized Gains on Investments | ASU 2016-01      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Adoption of ASU [1]     (616,000)
Cumulative Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (36,332,000) (36,332,000) (12,026,000)
Other comprehensive income (loss) before reclassifications   12,533,000 (24,306,000)
Net other comprehensive income (loss)   12,533,000 (24,306,000)
Ending Balance   (23,799,000) (36,332,000)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (11,643,000) (11,643,000) (11,158,000)
Other comprehensive income (loss) before reclassifications   (10,000) 359,000
Amounts reclassified from AOCI, net of tax   (247,000) 724,000
Net other comprehensive income (loss)   (257,000) 1,083,000
Ending Balance   (11,900,000) (11,643,000)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net | ASU 2018-02      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Adoption of ASU [2]     (1,568,000)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ (47,975,000) (47,975,000) (22,568,000)
Other comprehensive income (loss) before reclassifications   12,523,000 (23,947,000)
Amounts reclassified from AOCI, net of tax   (247,000) 724,000
Net other comprehensive income (loss)   12,276,000 (23,223,000)
Ending Balance   $ (35,699,000) (47,975,000)
Accumulated Other Comprehensive Income (Loss) | ASU 2018-02      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Adoption of ASU [2]     (1,568,000)
Accumulated Other Comprehensive Income (Loss) | ASU 2016-01      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Adoption of ASU [1]     $ (616,000)
[1]

(1)

Upon the adoption of ASU 2016-01, Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities, we recorded a cumulative-effect adjustment from unrealized gains on investments to beginning retained earnings.
[2] Upon the adoption of ASU 2018-02, Income Statement – Reporting Comprehensive Income: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, we recorded a cumulative-effect adjustment from AOCI to beginning retained earnings.