Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 98,869	$ 93,572
Less: accumulated depreciation	(55,014)	(48,516)
Net property and equipment	43,855	45,056
Land
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	3,857	3,857
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	64,446	63,107
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 30,566	$ 26,608