Related Party Transactions Related Party Transactions (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Related Party Transaction [Line Items]
Revenue, Net	$ 1,138,402	$ 938,660	$ 3,591,369	$ 3,278,501
Gross Profit	78,316	64,964	266,836	266,421
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	24,324	15,715	98,120	114,919
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	15,191	11,231	61,390	74,654
Net Income (Loss) Attributable to Parent	16,884	10,925	64,490	73,409
Lansing Trade Group LLC
Related Party Transaction [Line Items]
Revenue, Net	1,680,170	1,477,384	4,874,347	4,529,988
Gross Profit	50,412	35,867	126,330	103,225
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	20,108	13,925	49,014	39,584
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	18,545	12,918	47,486	37,144
Net Income (Loss) Attributable to Parent	$ 17,927	$ 12,864	$ 44,518	$ 35,114