Derivatives (Summary of Derivative Income Expense) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (loss) on Derivative, Net	$ 1,300,000	$ 0
Loss on derivatives activity	1,300,000	0
Commodity Swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (loss) on Derivative, Net	700,000
Change in fair value of derivatives	$ 600,000