Fixed Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Land	$ 93,300	$ 93,313
Buildings and building improvements	214,138	210,583
Leasehold improvements	70,025	64,935
Computer hardware and software	70,333	66,423
Furniture, fixtures and equipment	72,401	69,185
Construction in progress	3,927	14,016
Other	2,300	1,517
Fixed Assets, Gross	526,424	519,972
Less: Accumulated depreciation and amortization	(155,703)	(147,280)
Total	370,721	372,692
Depreciation and amortization expense	17,604	16,492	21,560
Fixed Assets [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 17,200	$ 15,600	$ 19,800