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Fair Value Measurements (Details Textual) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Derivative [Line Items]    
Derivative Liability, Fixed Rate Debt, Carrying Value $ 484,900,000 $ 386,900,000
Derivative Liability, Fixed Rate Debt, Fair Value 499,800,000 401,400,000
Derivative Liability, Variable Rate Debt, Fair Value $ 0 $ 14,000,000