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Fair Value Measurements (Narrative) (Details)
$ in Millions
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value Measurements [Abstract]    
Adjustment Interval of Variable Rate on Interest Rate Swap 90  
Interest rate swap agreement for notional amount $ 100.0  
Fair value of long term debt $ 1,714.8 $ 1,624.3