Loans Receivable and Other Lending Investments, net (Loans and Associated Reserve for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	$ 1,672,890		$ 1,672,890			$ 1,656,839
Less: Reserve for loan losses	(95,416)	$ (128,558)	(95,416)	$ (128,558)	$ (110,371)	(108,165)	$ (121,934)	$ (98,490)
Total	1,577,474		1,577,474			1,548,674
Reserve	95,416	128,558	95,416	128,558	$ 110,371	108,165	$ 121,934	$ 98,490
Release of general reserve	0	$ 876	0	$ 876
Interest receivable	7,800		7,800			9,000
Held-to-maturity and available-for-sale securities	62,552		62,552			62,289
Individually Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	296,700		296,700			132,492
Less: Reserve for loan losses	(74,216)		(74,216)			(72,165)
Total	222,484		222,484			60,327
Unamortized discounts, premiums, deferred fees and costs	400		400			200
Reserve	74,216		74,216			72,165
Collectively Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	1,376,190		1,376,190			1,524,347
Less: Reserve for loan losses	(21,200)		(21,200)			(36,000)
Total	1,354,990		1,354,990			1,488,347
Unamortized discounts, premiums, deferred fees and costs	300		300			$ 8,200
Non-performing loans | Individually Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	157,200		157,200
Less: Reserve for loan losses	(12,500)		(12,500)
Reserve	$ 12,500		12,500
Release of general reserve			$ 11,600