Notes Receivable and Allowance for Losses Narrative (Details) (USD $)	3 Months Ended		9 Months Ended					3 Months Ended		9 Months Ended					0 Months Ended	9 Months Ended					3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 category	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Senior Notes [Member]	Dec. 31, 2013 Senior Notes [Member]	Sep. 30, 2014 Forgivable Notes Receivable [Member]	Sep. 30, 2013 Forgivable Notes Receivable [Member]	Sep. 30, 2014 Forgivable Notes Receivable [Member]	Sep. 30, 2013 Forgivable Notes Receivable [Member]	Dec. 31, 2013 Forgivable Notes Receivable [Member]	Sep. 30, 2014 Forgivable Notes Receivable [Member] Senior Notes [Member]	Dec. 31, 2013 Forgivable Notes Receivable [Member] Senior Notes [Member]	Dec. 02, 2011 Mezzanine & Other Notes Receivable [Member]	Sep. 30, 2014 Mezzanine & Other Notes Receivable [Member]	Dec. 31, 2013 Mezzanine & Other Notes Receivable [Member]	Dec. 02, 2011 Mezzanine & Other Notes Receivable [Member]	Sep. 30, 2014 Mezzanine & Other Notes Receivable [Member] Senior Notes [Member]	Dec. 31, 2013 Mezzanine & Other Notes Receivable [Member] Senior Notes [Member]	Sep. 30, 2014 Impaired Loans [Member] Mezzanine & Other Notes Receivable [Member]	Sep. 30, 2013 Impaired Loans [Member] Mezzanine & Other Notes Receivable [Member]	Sep. 30, 2014 Impaired Loans [Member] Mezzanine & Other Notes Receivable [Member]	Sep. 30, 2013 Impaired Loans [Member] Mezzanine & Other Notes Receivable [Member]	Dec. 31, 2013 Impaired Loans [Member] Mezzanine & Other Notes Receivable [Member]	Sep. 30, 2014 Non-impaired Loans [Member] Mezzanine & Other Notes Receivable [Member]	Dec. 31, 2013 Non-impaired Loans [Member] Mezzanine & Other Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
Number of categories, credit losses for notes receivable			2
Notes receivable	$ 54,748,000		$ 54,748,000		$ 56,234,000	$ 10,150,000	$ 18,052,000	$ 25,660,000		$ 25,660,000		$ 20,625,000	$ 0	$ 0		$ 29,088,000	$ 35,609,000		$ 10,150,000	$ 18,052,000
Allowance for losses on non-impaired loans	12,416,000		12,416,000		11,546,000			2,498,000		2,498,000		1,650,000				9,918,000	9,896,000									1,600,000	1,600,000
Amortization expense	2,293,000	2,272,000	6,903,000	6,701,000				1,200,000	1,100,000	3,600,000	3,000,000
Impaired receivables, recorded investment																					11,800,000		11,800,000		12,500,000
Impaired receivables, related allowance																					8,300,000		8,300,000		8,300,000
Face value of notes value deemed impaired																					3,400,000		3,400,000		4,200,000
Average notes receivable, nonaccrual status																							12,200,000	13,200,000
Interest income, impaired loans																					11,000	81,000	87,000	200,000
Mortgage loans acquired																		11,500,000
Payments to acquire mortgage notes receivable															7,900,000
Required payments on acquired mortgage																12,000,000
Proceeds from collection of mortgage note receivable																7,900,000
Receivable acquired with deteriorated credit quality																				7,900,000
Mortgage loans receivable, allowance for uncollectable amounts																				0
Accretable yield at acquisition																		$ 1,800,000
Accretable yield percentage at acquisition																		7.36%