PROPERTY AND EQUIPMENT - NET (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 83,479	$ 74,989
Less accumulated depreciation and amortization	(30,164)	(21,854)
Total	53,315	53,135
Depreciation and amortization expense	12,335	9,858	6,759
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Property, Plant and Equipment, Gross, Total	5,903	5,527
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Property, Plant and Equipment, Gross, Total	5,688	4,351
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Property, Plant and Equipment, Gross, Total	4,679	4,325
Purchased Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Property, Plant and Equipment, Gross, Total	5,042	4,452
Computer Hardware [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Property, Plant and Equipment, Gross, Total	29,884	24,239
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	50 years
Property, Plant and Equipment, Gross, Total	16,534	16,534
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 15,749	$ 15,561