Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues and adjusted segment income by reportable segment
Total revenues	$ 3,699,175	$ 3,315,051	$ 7,103,774	$ 6,478,764
Segment income	99,642	77,860	185,232	154,644
Retail
Revenues and adjusted segment income by reportable segment
Total revenues	3,692,798	3,315,051	7,103,195	6,478,764
Segment income	91,441	70,659	175,868	143,609
Other
Revenues and adjusted segment income by reportable segment
Total revenues	15,090		21,976
Segment income	8,420	7,201	9,693	11,035
Intersegment Elimination
Revenues and adjusted segment income by reportable segment
Total revenues	(8,713)		(21,397)
Segment income	$ (219)		$ (329)