Acquisition (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 27, 2012	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Diluted
Pro forma adjustments, acqusition related costs						$ 11,808
Synventive [Member]
Business Acquisition [Line Items]
Aggregate purchase price	351,620
Cash paid	306,083
Cash acquired	9,366
Debt assumed	45,537
Repayments of debt	45,156
Acquisition related costs					2,409
Sales since date of acquisition		15,830
Operating loss since date of acquisition		2,896
Accounts Receivable, net	42,724
Inventory, net	13,546
Other current assets	3,988
Property, plant and equipment	16,481
Other noncurrent assets	2,841
Intangible assets	126,600
Goodwill	203,988
Total assets acquired	410,168
Current liabilities	(22,768)
Other liabilities	(4,361)
Deferred taxes	(40,785)
Total liabilities assumed	113,451
Net assets acquired	296,717
Net sales			328,880	337,796	1,004,098	994,098
Income from continuing operations			24,164	25,522	75,171	55,734
Net income			21,915	23,876	72,188	52,569
Basic:
Income from continuing operations (in dollars per share)			$ 0.44	$ 0.46	$ 1.38	$ 1.01
Net income (in dollars per share)			$ 0.40	$ 0.43	$ 1.32	$ 0.95
Diluted
Income from continuing operations (in dollars per share)			$ 0.44	$ 0.45	$ 1.36	$ 0.99
Net income (in dollars per share)			$ 0.40	$ 0.42	$ 1.31	$ 0.94
Pro forma adjustments, acqusition related costs						9,399
Pro forma adjustments, inventory						3,682
Pro forma adjustments, acquired backlog						1,200
Business Acquistion, Purchase Accouting Adjustments	5,117
Parent Company [Member]
Diluted
Pro forma adjustments, acqusition related costs						$ 2,409