Schedule II Valuation and Qualifying Accounts and Reserves (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts
Change in valuation and qualifying accounts and reserves
Balance at Beginning of period	$ 207,000	$ 2,375,000	$ 234,000
Charged to Costs and Expenses	0	137,000	2,585,000
Deductions	0	2,305,000	444,000
Balance at End of period	246,000	207,000	2,375,000
Allowance for loan loss
Change in valuation and qualifying accounts and reserves
Balance at Beginning of period	13,670,000	13,897,000	13,897,000
Charged to Costs and Expenses	0	0	0
Deductions	13,670	227,000	0
Balance at End of period	$ 0	$ 13,670,000	$ 13,897,000