Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues and adjusted segment income by reportable segment
Total revenues	$ 3,399,867	$ 3,156,390
Segment income	85,587	76,990
Retail
Revenues and adjusted segment income by reportable segment
Total revenues	3,405,665	3,156,390
Segment income	84,424	73,156
Other
Revenues and adjusted segment income by reportable segment
Total revenues	6,886
Segment income	1,273	3,834
Intersegment Elimination
Revenues and adjusted segment income by reportable segment
Total revenues	(12,684)
Segment income	$ (110)