Income Taxes - Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Tax Provision at the Federal Statutory Tax Rate	$ 25,489	$ 22,032	$ 20,782
Differences in Tax Rates on Foreign Earnings and Remittances	(2,487)	(3,207)	(3,692)
Foreign Dividends	1,922	815	735
Excess Foreign Tax Credit Utilization	(3,664)	(2,237)	(2,493)
Research and Development Activities Credit Utilization	(200)	0	(1,348)
Uncertain Tax Positions	(589)	(1,196)	701
Domestic Production Activities Deduction	(560)	(402)	0
State Income Tax Provisions, Net	171	(45)	250
Non-deductible Entertainment and Business Meals Expense	229	200	166
Non-taxable Gain on Acquisition	0	0	(951)
Miscellaneous Items, Net	178	(385)	106
Income Tax Expense (Benefit), Total	$ 20,489	$ 15,575	$ 14,256