Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 820,253	$ 762,864
Less - accumulated depreciation and amortization	(352,212)	(314,498)
Total property and equipment, net	468,041	448,366
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	64,495	58,545
Buildings and improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	152,812	142,099
Leasehold improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	193,274	176,487
Furniture and equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	296,789	272,820
Software [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	39,987	42,524
Buildings held under capital leases [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	59,555	59,555
Equipment held under capital leases [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	875	835
Less - accumulated depreciation and amortization	(17,000)	(13,700)
Construction in Progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 12,466	$ 9,999