Orange County-Poughkeepsie Limited Partnership (Narrative) (Details) (USD $)	6 Months Ended	12 Months Ended				3 Months Ended	12 Months Ended	3 Months Ended
	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Scenario, Forecast [Member]	Dec. 31, 2013 Scenario, Forecast [Member]	Mar. 31, 2013 Multiplied Value [Member] Scenario, Forecast [Member] item	Mar. 31, 2013 Ownership Percentage [Member] Scenario, Forecast [Member] item
Schedule of Equity Method Investments [Line Items]
Equity interest in O-P				8.108%	8.108%
Annual cash distributions to the Company from the O-P		$ 13,000,000	$ 13,600,000				$ 13,000,000
Aggregate strike price						50,000,000
Equity method investment put option value multiplier times EBITDA								5	0.081081
Equity method investment, amount the investment account was reduced to	$ 0