Unaudited Supplementary Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of selected quarterly financial information (unaudited)
Net sales	$ 578,189	$ 714,947	$ 657,457	$ 456,316	$ 548,832	$ 699,792	$ 692,758	$ 464,534	$ 2,406,909	$ 2,405,916	$ 2,543,707
Total revenues	614,627	760,752	701,971	487,200	586,242	743,204	736,152	493,264	2,564,550	2,558,862	2,690,490
Gross profit	74,355	115,780	100,840	(7,106)	50,750	126,747	122,335	894	283,869	300,726	445,962
Operating earnings (loss)	(5,528)	106,668	23,488	(61,184)	(29,412)	50,432	1,210	(36,770)	63,444	(14,540)	148,452
Earnings (loss) from continuing operations	(25,943)	22,412	(7,102)	(64,622)	(46,145)	10,591	(22,515)	(44,474)	(75,255)	(102,543)	18,648
Net earnings (loss)	$ (27,865)	$ 19,959	$ (8,139)	$ (54,733)	$ (46,997)	$ 13,246	$ (23,992)	$ (38,747)	$ (70,778)	$ (96,490)	$ 30,314
Basic earnings (loss) per share from continuing operations	$ (0.20)	$ 0.17	$ (0.05)	$ (0.50)	$ (0.36)	$ 0.08	$ (0.18)	$ (0.35)	$ (0.58)	$ (0.80)	$ 0.16
Diluted earnings (loss) per share from continuing operations	$ (0.20)	$ 0.17	$ (0.05)	$ (0.50)	$ (0.36)	$ 0.08	$ (0.18)	$ (0.35)	$ (0.58)	$ (0.80)	$ 0.16
Basic net earnings (loss) per share	$ (0.22)	$ 0.15	$ (0.06)	$ (0.42)	$ (0.37)	$ 0.10	$ (0.19)	$ (0.31)	$ (0.55)	$ (0.75)	$ 0.25
Diluted net earnings (loss) per share	$ (0.22)	$ 0.15	$ (0.06)	$ (0.42)	$ (0.37)	$ 0.10	$ (0.19)	$ (0.31)	$ (0.55)	$ (0.75)	$ 0.25