Transactions with Affiliates (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Chairman and Chief Executive Officer, and Certain Family Partnerships and Affiliates [Member]
Related Party Transaction [Line Items]
Investment commitments with related party	$ 6,000,000	$ 13,500,000
Due to related parties, current	16,000		42,000
Overhead recovery from related parties	78,000	75,000
Expense reimbursements from related parties	78,000	75,000
Other Affiliated Entities [Member]
Related Party Transaction [Line Items]
Overhead recovery from related parties	40,000	44,000
Expense reimbursements from related parties	40,000	44,000
Expense reimbursements to related parties	50,000	49,000
Estimated annual rental expense	480,000
Lease term	7 years
Rent expense paid	$ 240,000	$ 202,000