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Loans Receivable - Narrative (Details)
$ in Thousands, £ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loans Receivable          
Interest income     $ 56,237 $ 88,808 $ 112,184
Four Seasons          
Loans Receivable          
Proceeds from sale of loan receivables $ 35,000 £ 29      
Real Estate Secured          
Loans Receivable          
Interest income     $ 13,000