Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Schedule of Notional Amounts of Outstanding Derivative Positions (Details)

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Derivative Instruments - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - Interest Rate Derivatives [Member]
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Derivative [Line Items]  
Notional Amount of Interest Rate Derivatives $ 20.0
Effective Date Aug. 14, 2012
Maturity Date Jul. 31, 2019
Weighted Average Fixed Interest Rate Paid 1.98%
Variable Interest Rate Received One-month LIBOR
Maximum [Member]  
Derivative [Line Items]  
Notional Amount of Interest Rate Derivatives $ 628.8