Property and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 88,684,000	$ 41,750,000
Less: Accumulated depreciation	(20,108,000)	(13,303,000)
Property and equipment, net	68,576,000	28,447,000
Depreciation expense	7,800,000	4,200,000	2,500,000
Building and Equipment
Property, Plant and Equipment [Line Items]
Gross property and equipment	1,109,000	2,241,000
Less: Accumulated depreciation	(396,000)	(942,000)
Property and equipment, net	713,000	1,299,000
Land and Land Improvements
Property, Plant and Equipment [Line Items]
Gross property and equipment	364,000	232,000
Building and Lease hold Improvements
Property, Plant and Equipment [Line Items]
Gross property and equipment	6,458,000	4,363,000
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Gross property and equipment	12,327,000	9,363,000
Equipment
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 69,535,000	$ 27,792,000