Segment Results (Schedule of Financial Information by Business Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues	$ 610,693	$ 449,519	$ 1,142,546	$ 871,683
Operating income	99,172	56,587	185,995	104,051
Interest expense	3,934	6,062	9,281	12,178
Other expense (income), net	279	(2)	(683)	(637)
Income (loss) before income taxes	94,959	50,527	177,397	92,510
Industrial Products Group [Member]
Revenues	327,846	268,650	614,056	515,044
Operating income	34,325	20,157	65,127	39,710
Operating income as a percentage of revenues	10.50%	7.50%	10.60%	7.70%
Engineered Products Group [Member]
Revenues	282,847	180,869	528,490	356,639
Operating income	$ 64,847	$ 36,430	$ 120,868	$ 64,341
Operating income as a percentage of revenues	22.90%	20.10%	22.90%	18.00%