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Operations and Summary of Significant Accounting Policies - Comprehensive Income (Loss) - (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
bank
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Accounting Policies [Abstract]      
Number of banks where demand deposit or money market accounts are held by the company | bank 15    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance, beginning of period $ (28,576) $ (7,180) $ 18,086
Other Comprehensive Income (Loss), Net of Tax (4,394) (21,165) (25,266)
Amounts reclassified from accumulative other comprehensive income, net of tax 0 (231)  
Balance, end of period (32,970) (28,576) (7,180)
Asia      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Amounts reclassified from accumulative other comprehensive income, net of tax   (200)  
Foreign currency translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance, beginning of period (27,552) (6,613) 18,283
Other Comprehensive Income (Loss), Net of Tax (3,920) (20,708) (24,896)
Amounts reclassified from accumulative other comprehensive income, net of tax   (231)  
Balance, end of period (31,472) (27,552) (6,613)
Other comprehensive income (loss) before reclassification, tax expense (benefit) (222) (57) (63)
Reclassification from AOCI, tax expense (benefit)   0  
Pension benefit      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance, beginning of period (1,024) (567) (197)
Other Comprehensive Income (Loss), Net of Tax (474) (457) (370)
Amounts reclassified from accumulative other comprehensive income, net of tax 0 0  
Balance, end of period (1,498) (1,024) (567)
Other comprehensive income (loss) before reclassification, tax expense (benefit) $ 87 $ 82 $ 67