Summary of Significant Accounting Policies (Property and Equipment, Including Original Useful Lives) (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Maximum [Member] Building and Building Improvements [Member]	Dec. 31, 2012 Maximum [Member] Leasehold Improvements [Member]	Dec. 31, 2012 Maximum [Member] Furniture, Fixtures and Equipment [Member]	Dec. 31, 2012 Maximum [Member] Vehicles [Member]	Dec. 31, 2012 Minimum [Member] Building and Building Improvements [Member]	Dec. 31, 2012 Minimum [Member] Leasehold Improvements [Member]	Dec. 31, 2012 Minimum [Member] Furniture, Fixtures and Equipment [Member]	Dec. 31, 2012 Minimum [Member] Vehicles [Member]
Land	$ 420,292	$ 462,790
Building and building improvements	1,078,265	1,012,709
Leasehold improvements	447,046	395,274
Furniture, fixtures and equipment	932,406	906,257
Vehicles	231,615	206,685
Construction in progress	159,946	43,281
Total property and equipment	3,269,570	3,026,996
Less: accumulated depreciation and amortization	1,057,980	933,229
Net property and equipment	$ 2,211,590	$ 2,093,767
Property, plant and equipment, useful life, in years			39 years	25 years	20 years	10 years	15 years	3 years	3 years	5 years