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Derivative and Other Fair Value Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Fair Value Hedging maturity date 2019 [Member]
 
Derivative [Line Items]  
Current Notional Balance $ 450,000
Lowest Possible Notional 450,000
Highest Possible Notional 450,000
Lowest Interest Rate 2.375%
Highest Interest Rate 2.375%
Forward Starting Swaps Fair Value Hedging maturity date 2025 [Member]
 
Derivative [Line Items]  
Current Notional Balance 100,000
Lowest Possible Notional 100,000
Highest Possible Notional $ 100,000
Lowest Interest Rate 3.14%
Highest Interest Rate 3.191%