Operations and Summary of Significant Accounting Policies - Comprehensive Income (Loss) - (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) bank	Dec. 31, 2014 USD ($)	Dec. 31, 2013 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	$ (7,180)	$ 18,086	$ 12,099
Other Comprehensive Income (Loss), Net of Tax	(21,165)	(25,266)	3,193
Amounts reclassified from accumulative other comprehensive income, net of tax	0		2,794
Balance, end of period	(28,576)	(7,180)	18,086
Cumulative currency translation adjustment			2,800
Asia
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amounts reclassified from accumulative other comprehensive income, net of tax			0
Foreign currency translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(6,613)	18,283	12,342
Other Comprehensive Income (Loss), Net of Tax	(20,708)	(24,896)	3,147
Amounts reclassified from accumulative other comprehensive income, net of tax			2,794
Balance, end of period	(27,552)	(6,613)	18,283
Other comprehensive income (loss) before reclassification, tax expense (benefit)	(57)	(63)	29
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	(567)	(197)	(243)
Other Comprehensive Income (Loss), Net of Tax	(457)	(370)	46
Amounts reclassified from accumulative other comprehensive income, net of tax			0
Balance, end of period	(1,024)	(567)	(197)
Other comprehensive income (loss) before reclassification, tax expense (benefit)	$ 82	$ 67	$ (3)