Discontinued Operations - Results of Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Discontinued Operations and Disposal Groups [Abstract]
Net sales					$ 0	$ 45,480	$ 40,850
Income from discontinued operations, before income tax expense					0	14,600	10,290
Income tax expense					0	(5,050)	(3,950)
Income from discontinued operations, net of income tax expense	$ 6,120	$ 1,290	$ 1,080	$ 1,060	$ 0	$ 9,550	$ 6,340