Income Taxes - Components of Expense and Earnings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current Income Tax Expense (Benefit) [Abstract]
Federal	$ 3,318	$ 3,485	$ 1,429
State	(69)	385	195
Foreign	9,972	7,955	9,143
Current Income Tax Expense (Benefit), Total	13,221	11,825	10,767
Deferred Income Tax Expense (Benefit) [Abstract]
Federal	4,409	2,022	1,204
State	(794)	0	0
Foreign	(1,261)	409	645
Income Tax Expense (Benefit), Total	15,575	14,256	12,616
Components Of Earnings Before Taxes [Abstract]
Domestic	26,520	24,071	9,482
Foreign	36,428	35,306	36,731
Income before taxes and equity in net income of associated companies	$ 62,948	$ 59,377	$ 46,213