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Derivatives - Schedule of Outstanding Interest Rate Swaps (Details) - Jun. 30, 2015 - Interest Rate Swap [Member] - USD ($)
Total
1.48% [Member]  
Derivative [Line Items]  
Derivative notional amount $ 750,000,000
Interest Rate Received 1 month LIBOR
Interest Rate Paid 1.48%
Effective Date Dec. 31, 2015
Debt instrument, maturity date Dec. 30, 2016
2.19% [Member]  
Derivative [Line Items]  
Derivative notional amount $ 750,000,000
Interest Rate Received 1 month LIBOR
Interest Rate Paid 2.19%
Effective Date Dec. 30, 2016
Debt instrument, maturity date Dec. 29, 2017
2.61% [Member]  
Derivative [Line Items]  
Derivative notional amount $ 750,000,000
Interest Rate Received 1 month LIBOR
Interest Rate Paid 2.61%
Effective Date Dec. 29, 2017
Debt instrument, maturity date Dec. 31, 2018
2.03% [Member]  
Derivative [Line Items]  
Derivative notional amount $ 400,000,000
Interest Rate Received 1 month LIBOR
Interest Rate Paid 2.03%
Effective Date Jul. 29, 2011
Debt instrument, maturity date Sep. 30, 2014
2.51% [Member]  
Derivative [Line Items]  
Derivative notional amount $ 350,000,000
Interest Rate Received 1 month LIBOR
Interest Rate Paid 2.51%
Effective Date Apr. 30, 2012
Debt instrument, maturity date Sep. 30, 2014