Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings (loss) from discontinued operations before gain on disposal	$ (226)	$ 1,214	$ 130
Gain on disposal of discontinued operations, net of taxes	1,323	0	0
Earnings from discontinued operations, net of taxes	1,097	1,214	130
Distribution Segment Canadian Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales of discontinued operations	20,117	20,619	18,581
Income from discontinued operations	92	1,250	247
Other income (expense) from discontinued operations	(106)	(36)	(117)
Earnings from discontinued operations before income taxes	(14)	1,214	130
Provision for income taxes	212	0	0
Earnings (loss) from discontinued operations before gain on disposal	(226)	1,214	130
Gain on disposal of discontinued operations, before taxes	2,645	0	0
Provision for income taxes on gain	1,322	0	0
Gain on disposal of discontinued operations, net of taxes	1,323	0	0
Earnings from discontinued operations, net of taxes	$ 1,097	$ 1,214	$ 130