Other Assets (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Other Assets [Line Items]
Estimated Insurance Recoveries		$ 1,300,000
Other Assets	16,278,000	25,722,000
Deposits
Other Assets [Line Items]
Other Assets	769,000	1,273,000
Prepaid expenses
Other Assets [Line Items]
Other Assets	5,100,000	8,139,000
Taxes receivable
Other Assets [Line Items]
Other Assets	2,105,000	2,064,000
Derivative contracts, at fair value
Other Assets [Line Items]
Other Assets	202,000	807,000
Deferred rent asset
Other Assets [Line Items]
Other Assets	433,000	0
Receivable from portfolio companies
Other Assets [Line Items]
Other Assets	34,000	3,451,000
Interest receivable
Other Assets [Line Items]
Other Assets	4,261,000	5,800,000
Other
Other Assets [Line Items]
Other Assets	$ 3,374,000	$ 4,188,000