Segment Information (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues
Revenues	$ 2,888,420	$ 2,614,602	$ 5,683,907	$ 5,038,789
Adjusted segment income
Adjusted segment income	61,391	47,445	116,303	85,070
Retail [Member]
Revenues
Revenues	2,888,420	2,614,602	5,683,907	5,038,789
Adjusted segment income
Adjusted segment income	55,123	43,343	108,911	81,473
PAG Investments [Member]
Adjusted segment income
Adjusted segment income	$ 6,268	$ 4,102	$ 7,392	$ 3,597