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Fair Value of Assets and Liabilities - Schedule of Assets and Liabilities Measure at Fair Value (Details) - Recurring - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Recurring Fair Value Measurements:    
Effective portion of interest rate swap contracts $ (3,687) $ (7,462)
Derivative liability (7,219) (6,658)
Level 1    
Recurring Fair Value Measurements:    
Effective portion of interest rate swap contracts 0 0
Derivative liability 0 0
Level 2    
Recurring Fair Value Measurements:    
Effective portion of interest rate swap contracts (3,687) (7,462)
Derivative liability 0 0
Level 3    
Recurring Fair Value Measurements:    
Effective portion of interest rate swap contracts 0 0
Derivative liability $ (7,219) $ (6,658)