Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 600,763	$ 529,844
Less - accumulated depreciation and amortization	(230,117)	(198,157)
Total property and equipment, net	370,646	331,687
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	53,425	52,562
Buildings and improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	120,227	110,557
Leasehold improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	127,790	113,593
Furniture and equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	216,042	193,086
Software [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	22,932	15,983
Buildings held under capital leases [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	31,627	20,864
Equipment held under capital leases [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	1,034	947
Construction in Progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 27,686	$ 22,252

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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