Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Oct. 19, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Goodwill purchase price adjustment		$ (1,436)	$ 5,239
Summary of fair values assigned to acquired assets [Abstract]
Goodwill		201,913	211,903	205,365
Total cash paid, net of $1,961 cash acquired		0	(2,449)	25,232
Amortization of intangible assets		4,108	5,208	5,165
Estimated amortization of acquired intangible assets in 2014		3,933
Estimated amortization of acquired intangible assets in 2015		3,746
Estimated amortization of acquired intangible assets in 2016		3,696
Estimated amortization of acquired intangible assets in 2017		3,508
Estimated amortization of acquired intangible assets in 2018		3,434
Exit Reserves from Prior Acquisitions [Abstract]
Lease expiration date		Dec. 31, 2014
Facility closure [Member]
Summary of reserve activity for facility closure costs [Roll Forward]
Beginning of Period		324	367	780
Adjustments		(283)	44	(246)
Payments		(41)	(87)	(167)
End of Period		0	324	367
Lipson Associates, Inc. and Laga, Inc. [Member]
Business Acquisition [Line Items]
Acquisition Date		Oct. 19, 2011
Purchase price	24,562
Cash paid	27,011
Cash received for net working capital adjustment			2,449
Goodwill purchase price adjustment		(1,436)
Summary of fair values assigned to acquired assets [Abstract]
Accounts receivable	4,939
Inventory	4,117
Prepaid expenses and other current assets	1,365
Income tax receivable	8
Property and equipment	482
Goodwill	17,494
Other assets	241
Trade accounts payable	(3,247)
Accrued expenses	(7,192)
Notes payable	(23)
Deferred income taxes	(247)
Other long term liabilities	(1,522)
Total cash paid, net of $1,961 cash acquired	22,601
Cash acquired	1,961
Amortization of intangible assets		901	830	250
Estimated amortization of acquired intangible assets in 2014		823
Estimated amortization of acquired intangible assets in 2015		823
Estimated amortization of acquired intangible assets in 2016		794
Estimated amortization of acquired intangible assets in 2017		679
Estimated amortization of acquired intangible assets in 2018		679
Lipson Associates, Inc. and Laga, Inc. [Member] | Trade names [Member]
Summary of fair values assigned to acquired assets [Abstract]
Intangible assets	729
Weighted average amortization periods		5 years
Lipson Associates, Inc. and Laga, Inc. [Member] | Customer relationships [Member]
Summary of fair values assigned to acquired assets [Abstract]
Intangible assets	$ 5,457
Weighted average amortization periods		8 years