Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Net Sales	$ 410,307	$ 483,297	$ 1,503,087	$ 1,611,356
Segment income (loss)	62,312	85,207	274,120	319,604
Interest expense, net	(3,592)	(5,479)	(12,010)	(17,354)
Loss on early retirement of debt	(1,254)	(277)	(1,254)	(1,176)
Income before income taxes	57,466	79,451	260,856	301,074
Depreciation and amortization	19,470	21,794	60,682	67,106
Capital expenditures	10,481	8,787	23,188	22,839
Propel [Member]
Segment Reporting Information [Line Items]
Net Sales	204,759	235,123	694,458	735,313
Segment income (loss)	42,825	51,513	147,623	178,164
Depreciation and amortization	7,610	7,945	23,403	24,925
Capital Expenditures	4,552	1,962	8,060	9,482
Work Function [Member]
Segment Reporting Information [Line Items]
Net Sales	67,361	89,328	242,669	294,810
Segment income (loss)	8,368	13,379	40,018	50,118
Depreciation and amortization	4,801	5,468	14,976	16,598
Capital Expenditures	1,056	880	3,528	1,795
Controls [Member]
Segment Reporting Information [Line Items]
Net Sales	69,668	82,703	239,135	250,705
Segment income (loss)	17,538	23,303	63,131	71,629
Depreciation and amortization	3,018	3,397	9,409	10,436
Capital Expenditures	1,477	1,298	3,321	3,010
Stand Alone [Member]
Segment Reporting Information [Line Items]
Net Sales	68,519	76,143	326,825	330,528
Segment income (loss)	5,734	5,322	56,380	51,735
Depreciation and amortization	3,524	4,424	11,391	13,459
Capital Expenditures	2,871	2,786	6,683	5,738
Global Services [Member]
Segment Reporting Information [Line Items]
Net Sales	0	0	0	0
Segment income (loss)	(12,153)	(8,310)	(33,032)	(32,042)
Depreciation and amortization	517	560	1,503	1,688
Capital Expenditures	$ 525	$ 1,861	$ 1,596	$ 2,814