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Schedule IV - Mortgage Loans on Real Estate - Reconciliation of Mortgage Loans on Real Estate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement in Mortgage Loans on Real Estate [Roll Forward]      
Balance at January 1 $ 726,426 $ 827,796 $ 1,421,654
Additions:      
New mortgage loans 237,031 476,332 19,249
Additions under existing mortgage loans 92,887 13,108 31,589
Other 33,080 26,156 16,385
Deductions:      
Collections of principal (151,464) (532,465) (636,883)
(Provision for) recovery of loan losses (6,186) 483 25,011
Transfers from (to) real estate and equity investments 3,261 (84,912) (49,100)
Amortization of premium (71) (72) (109)
Balance at December 31 934,964 726,426 827,796
Charge offs $ 1,000 $ 239,600 $ 152,800