Revolving Line of Credit (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Revolving Line of Credit (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000,000		$ 50,000,000
Loan bearing interest			Libor plus 3%
Extend maturity period of revolving line of credit			1 year
Line of Credit Facility Basis Spread On Variable Rate	3.00%		3.00%
Line of Credit Facility, Expiration Date			Mar. 03, 2014
Line of Credit Facility Extended Maturity Date			Mar. 03, 2015
Line of Credit Facility, Amount Outstanding	0		0		40,000,000
Line of Credit Facility, Commitment Fee Amount	$ 43,000	$ 56,000	$ 62,000	$ 65,000