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Operations and Summary of Significant Accounting Policies - Comprehensive Income (Loss) - (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
bank
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounting Policies [Abstract]      
Number of banks where demand deposit or money market accounts are held by the company | bank 17    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance, beginning of period $ (32,970) $ (28,576) $ (7,180)
Other Comprehensive Income (Loss), Net of Tax 20,329 (4,394) (21,165)
Amounts reclassified from accumulative other comprehensive income, net of tax 0   231
Balance, end of period (12,496) (32,970) (28,576)
Reclassification from AOCI, tax expense (benefit) 0   0
Foreign currency translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance, beginning of period (31,472) (27,552) (6,613)
Other Comprehensive Income (Loss), Net of Tax 21,273 (3,920) (20,708)
Amounts reclassified from accumulative other comprehensive income, net of tax     231
Balance, end of period (10,054) (31,472) (27,552)
Other comprehensive income (loss) before reclassification, tax expense (benefit) 0 222 57
Pension benefit      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance, beginning of period (1,498) (1,024) (567)
Other Comprehensive Income (Loss), Net of Tax (944) (474) (457)
Amounts reclassified from accumulative other comprehensive income, net of tax 0  
Balance, end of period (2,442) (1,498) (1,024)
Other comprehensive income (loss) before reclassification, tax expense (benefit) $ (36) $ (87) $ (82)