Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Net Sales	$ 518,787	$ 563,317	$ 1,092,780	$ 1,128,059
Segment income (loss)	97,499	117,678	211,808	234,397
Interest expense, net	(4,047)	(5,774)	(8,418)	(11,875)
Loss on early retirement of debt	0	(899)	0	(899)
Income before income taxes	93,452	111,005	203,390	221,623
Depreciation and amortization	20,535	22,840	41,212	45,312
Capital expenditures	7,373	8,534	12,707	14,052
Propel [Member]
Segment Reporting Information [Line Items]
Net Sales	233,373	249,960	489,699	500,190
Segment income (loss)	49,522	61,531	104,798	126,651
Depreciation and amortization	7,931	8,543	15,793	16,980
Capital Expenditures	2,163	4,245	3,508	7,520
Work Function [Member]
Segment Reporting Information [Line Items]
Net Sales	83,075	105,776	175,308	205,482
Segment income (loss)	13,773	19,409	31,650	36,739
Depreciation and amortization	5,108	5,688	10,175	11,130
Capital Expenditures	1,518	371	2,472	915
Controls [Member]
Segment Reporting Information [Line Items]
Net Sales	84,899	88,663	169,467	168,002
Segment income (loss)	22,285	25,576	45,593	48,326
Depreciation and amortization	3,248	3,547	6,391	7,039
Capital Expenditures	1,018	1,239	1,844	1,712
Stand Alone [Member]
Segment Reporting Information [Line Items]
Net Sales	117,440	118,918	258,306	254,385
Segment income (loss)	22,551	20,495	50,646	46,413
Depreciation and amortization	3,879	4,503	7,867	9,035
Capital Expenditures	2,065	1,958	3,812	2,952
Global Services [Member]
Segment Reporting Information [Line Items]
Net Sales	0	0	0	0
Segment income (loss)	(10,632)	(9,333)	(20,879)	(23,732)
Depreciation and amortization	369	559	986	1,128
Capital Expenditures	$ 609	$ 721	$ 1,071	$ 953