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Fair Value Measurements - Assumptions (Details) - Level 3 - Discounted Cash Flow Analysis
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Senior Unsecured Notes maturing before 2026    
Fair value assumptions    
Discount rate (as a percent) 4.35%  
Senior Unsecured Notes maturing 2026 and after    
Fair value assumptions    
Discount rate (as a percent) 4.65%  
Senior Unsecured Notes maturing before 2020    
Fair value assumptions    
Discount rate (as a percent)   3.80%
Senior Unsecured Notes maturing 2020 and after    
Fair value assumptions    
Discount rate (as a percent)   4.55%
Earn-out liabilities    
Fair value assumptions    
Discount rate (as a percent) 6.10% 6.20%
Mortgage Loans Receivable    
Fair value assumptions    
Discount rate (as a percent) 8.90% 8.60%