Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 90,796	$ 88,021
Less: accumulated depreciation	(49,927)	(45,463)
Net property and equipment	40,869	42,558
Land
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	2,364	2,364
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	59,480	58,707
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 28,952	$ 26,950