Segments Table (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net sales	$ 184,297	$ 184,059	$ 184,846	$ 176,193	$ 172,868	$ 180,923	$ 176,797	$ 177,638	$ 729,395	$ 708,226	$ 683,231
Operating income for reportable segments	142,500				126,971				142,500	126,971	124,274
Segment assets	584,146				536,634				584,146	536,634
Capital Expenditures									11,439	12,735	12,117
North America [Member]
Segment Reporting Information [Line Items]
Net sales									308,353	310,127	268,519
Operating income for reportable segments	61,307				58,571				61,307	58,571	48,342
Segment assets	304,069				284,362				304,069	284,362	289,761
Long-Lived Assets	91,464				91,121				91,464	91,121	90,800
Capital Expenditures									2,793	3,262	5,185
Depreciation									5,236	5,635	4,739
North America [Member] | Non Domestic [Member]
Segment Reporting Information [Line Items]
Net sales									29,002	27,125	12,818
Long-Lived Assets	3,649				3,716				3,649	3,716	3,576
North America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales									8,984	10,026	13,728
EMEA [Member]
Segment Reporting Information [Line Items]
Net sales									187,794	174,799	184,063
Operating income for reportable segments	29,643				24,640				29,643	24,640	32,145
Segment assets	104,774				102,159				104,774	102,159	88,494
Long-Lived Assets	20,863				20,056				20,863	20,056	19,243
Capital Expenditures									1,391	3,332	2,442
Depreciation									3,145	2,906	2,922
EMEA [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales									20,135	15,414	17,246
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales									169,505	157,062	151,468
Operating income for reportable segments	42,373				37,030				42,373	37,030	32,145
Segment assets	129,894				101,760				129,894	101,760	81,086
Long-Lived Assets	24,695				19,720				24,695	19,720	15,225
Capital Expenditures									6,386	5,451	2,614
Depreciation									2,080	1,720	1,774
Asia Pacific [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales									504	321	399
South America [Member]
Segment Reporting Information [Line Items]
Net sales									63,743	66,238	79,181
Operating income for reportable segments	9,177				6,730				9,177	6,730	11,642
Segment assets	45,409				48,353				45,409	48,353	51,811
Long-Lived Assets	4,130				5,276				4,130	5,276	6,577
Capital Expenditures									869	690	1,876
Depreciation									1,211	1,333	1,454
South America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales									0	0	0
Total [Member]
Segment Reporting Information [Line Items]
Segment assets	584,146				536,634				584,146	536,634	511,152
Long-Lived Assets	141,152				136,173				141,152	136,173	131,845
Capital Expenditures									11,439	12,735	12,117
Depreciation									$ 11,672	$ 11,594	$ 10,889