Derivative Instruments and Hedging Activities (Derivatives Not Designated as Hedging Instruments) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative [Line Items]
Total non-designated derivative realized loss, net	$ 272,000	$ 0	$ 272,000	$ 0
Commodity options
Derivative [Line Items]
Notional amount	12,600,000		12,600,000
Total non-designated derivative realized loss, net	$ 272,000	$ 0	$ 272,000	$ 0