Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.1.9
Derivative Instruments - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) (Interest Rate Derivatives [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Derivative [Line Items]  
Notional Amount of Interest Rate Derivatives $ 20.0invest_DerivativeNotionalAmount
Effective Date Aug. 14, 2012
Maturity Date Jul. 31, 2019
Weighted Average Fixed Interest Rate Paid 1.98%us-gaap_DerivativeAverageFixedInterestRate
Variable Interest Rate Received One-month LIBOR
Maximum [Member]
 
Derivative [Line Items]  
Notional Amount of Interest Rate Derivatives $ 691.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember