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Fair Value Disclosure - Summarizes Levels in Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments $ 3,327 $ 4,070
Total 496,476 543,905
AAA Commercial Mortage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS 0 17,105
Estimate of Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 3,327 4,070
Estimate of Fair Value [Member] | AAA Commercial Mortage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS 493,149 522,730
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 496,476 543,905
Level 2 [Member] | AAA Commercial Mortage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS 0 17,105
Level 2 [Member] | Estimate of Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 3,327 4,070
Level 2 [Member] | Estimate of Fair Value [Member] | AAA Commercial Mortage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS $ 493,149 $ 522,730