Acquisitions (Schedule of Pro Forma Results of Operations, Including Acquisition) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Acquisitions
Net sales	$ 211,957	$ 175,597	$ 375,163	$ 349,054
Net income	$ 3,014	$ (77,996)	$ 3,852	$ (103,284)
Basic earnings per share of common stock	$ 0.04	$ (1.08)	$ 0.05	$ (1.44)
Diluted earnings per share of common stock	$ 0.04	$ (1.08)	$ 0.05	$ (1.44)