Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings from Continuing Operations before Income Taxes [Abstract]
United States	$ 113,967	$ 118,269	$ 180,022
Foreign	135,562	110,717	111,890
Earnings from continuing operations before income taxes	249,529	228,986	291,912
Current tax expense (benefit):
Federal	30,224	38,249	53,187
State	5,511	4,413	(3,075)
Foreign	11,389	13,483	21,138
Current income tax expense (benefit)	47,124	56,145	71,250
Deferred tax expense (benefit):
Federal	1,207	(252)	3,194
State	(1,115)	(335)	1,887
Foreign	2,052	(3,587)	(9,775)
Deferred income tax expense (benefit)	2,144	(4,174)	(4,694)
Total provision	$ 49,268	$ 51,971	$ 66,556