Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 677,907	$ 600,763
Less - accumulated depreciation and amortization	(274,463)	(230,117)
Total property and equipment, net	403,444	370,646
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	56,162	53,425
Buildings and improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	137,614	120,227
Leasehold improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	140,944	127,790
Furniture and equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	243,429	216,042
Software [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	32,676	22,932
Buildings held under capital leases [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	30,550	31,627
Equipment held under capital leases [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	849	1,034
Less - accumulated depreciation and amortization	(10,500)	(5,500)
Construction in Progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 35,683	$ 27,686