Property And Equipment (Major Classes Of Property And Equipment) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 111,968,000	$ 61,219,000
Less: Accumulated depreciation and amortization	(64,533,000)	(34,133,000)
Total property and equipment-net	47,435,000	27,086,000
Depreciation and amortization expense	33,700,000	5,000,000	4,900,000
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	88,623,000	39,271,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 23,345,000	$ 21,948,000