Property and Equipment, net (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Feb. 28, 2013 acre sqft	Dec. 31, 2012
Property and Equipment, net (Textual) [Abstract]
Total purchase price of property	$ 16,493		$ 16,426
Property and Equipment, net (Additional Textual) [Abstract]
Area of land		1.6
Gross area of vacant office building		16,000
Land [Member]
Property and Equipment, net (Textual) [Abstract]
Total purchase price of property		2,000