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Loans Receivable and Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans, unsecured loans, and other available-for-sale securities, carrying amount $ 754,565 $ 895,038
Secured loans, unsecured loans, and other available-for-sale securities, amortized cost 753,326 893,489
Secured loans, unsecured loans, and other available-for-sale securities, fair value 764,656 919,334
Available-for-sale securities, unrealized gain (loss) 1,239 1,549
Total investments reported as Secured loans receivable and investments, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans, unsecured loans, and other available-for-sale securities, carrying amount 702,021 857,112
Secured loans, unsecured loans, and other available-for-sale securities, amortized cost 700,782 855,563
Secured loans, unsecured loans, and other available-for-sale securities, fair value 711,030 880,528
Available-for-sale securities, unrealized gain (loss) 1,239 1,549
Total investments reported as Other assets    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans, unsecured loans, and other available-for-sale securities, carrying amount 52,544 37,926
Secured loans, unsecured loans, and other available-for-sale securities, amortized cost 52,544 37,926
Secured loans, unsecured loans, and other available-for-sale securities, fair value 53,626 38,806
Available-for-sale securities, unrealized gain (loss) 0 0
Government-sponsored pooled loan investments    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Marketable securities 55,049 63,679
Available-for-sale securities, amortized cost 53,810 62,130
Available-for-sale securities, unrealized gain (loss) 1,239 1,549
Secured mortgage loans and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan receivable, carrying amount and amortized cost 646,972 793,433
Mortgage loans and other, fair value 655,981 816,849
Available-for-sale securities, unrealized gain (loss) 0 0
Non-mortgage loans receivable, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan receivable, carrying amount and amortized cost 52,544 37,926
Mortgage loans and other, fair value 53,626 38,806
Available-for-sale securities, unrealized gain (loss) $ 0 $ 0