Transactions with Affiliates (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Chairman and Chief Executive Officer, and Certain Family Partnerships and Affiliates [Member]
Related Party Transaction [Line Items]
Investment commitments with related party	$ 13,500,000	$ 12,400,000
Due to related parties, current	43,000		58,000
Overhead recovery from related parties	75,000	84,000
Expense reimbursements from related parties	75,000	84,000
Other Affiliated Entities [Member]
Related Party Transaction [Line Items]
Overhead recovery from related parties	49,000	59,000
Expense reimbursements to related parties	44,000	25,000
Expense reimbursements from related parties	49,000	59,000
Estimated annual rental expense	480,000
Lease Term	7 years
Rent expense paid	$ 202,000