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Orange County-Poughkeepsie Limited Partnership (Narrative) (Details) - Orange County-Poughkeepsie Limited Parnership [Member] - USD ($)
9 Months Ended 12 Months Ended
Apr. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2012
Apr. 29, 2014
Option Indexed to Issuer's Equity [Line Items]          
Equity interest in O-P         8.108%
Equity method investment, amount the investment account was reduced to   $ 0 $ 0 $ 0  
Put Option [Member]          
Option Indexed to Issuer's Equity [Line Items]          
Proceeds of sale of equity method investment $ 50,000,000        
Gain on sale of equity method investment $ 49,800,000