Loans Receivable and Other Lending Investments, net (Loans and Associated Reserve for Loan Losses) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Gross	$ 1,461,499,000		$ 1,295,703,000
Financing Receivable, Allowance for Credit Losses	102,783,000		98,490,000		370,076,000	377,204,000
Financing Receivable, Net	1,358,716,000		1,197,213,000
Collectively Evaluated for Impairment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	(11,500,000)		(10,600,000)
Financing Receivable, Gross	1,324,454,000	[1]	1,156,031,000	[1]
Financing Receivable, Allowance for Credit Losses	38,000,000	[1]	33,500,000	[1]
Financing Receivable, Net	1,286,454,000	[1]	1,122,531,000	[1]
Individually Evaluated for Impairment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	(200,000)		(200,000)
Financing Receivable, Gross	137,045,000	[2]	139,672,000	[2]
Financing Receivable, Allowance for Credit Losses	64,783,000	[2]	64,990,000	[2]
Financing Receivable, Net	$ 72,262,000	[2]	$ 74,682,000	[2]

[1] The carrying value of these loans include unamortized discounts, premiums, deferred fees and costs aggregating to a net discount of $11.5 million and $10.6 million as of March 31, 2015 and December 31, 2014, respectively.

[2] The carrying value of these loans include unamortized discounts, premiums, deferred fees and costs aggregating to a net discount of $0.2 million and $0.2 million as of March 31, 2015 and December 31, 2014, respectively. The Company's loans individually evaluated for impairment primarily represent loans on non-accrual status and therefore, the unamortized amounts associated with these loans are not currently being amortized into income.