Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Income before income taxes, U.S.	$ 32,549,000	$ 26,640,000	$ 14,189,000
Income before income taxes, foreign	119,053,000	113,908,000	108,676,000
Income before income taxes	151,602,000	140,548,000	122,865,000
Current:
Income tax expense, federal	(851,000)	8,173,000	7,767,000
Income tax expense, state	419,000	475,000	395,000
Income tax expense, foreign	16,513,000	13,870,000	18,559,000
Total current income tax expense	16,081,000	22,518,000	26,721,000
U.S. deferred expense (benefit)	12,645,000	4,285,000	(6,266,000)
Foreign deferred benefit	(3,797,000)	(1,175,000)	(1,227,000)
Total income tax expense	24,929,000	25,628,000	19,228,000
Tax benefit from stock options exercised	6,400,000	3,100,000	2,900,000
Deferred tax benefit recorded in other comprehensive income	$ (1,100,000)	$ (3,000,000)	$ (3,000,000)