Significant Accounting Policies Significant Accounting Policies (Write-down of Oil and Natural Gas Properties) (Details Textuals 2)	12 Months Ended
	Dec. 31, 2015 $ / Mcf $ / Barrel	Sep. 30, 2015 $ / Mcf $ / Barrel	Jun. 30, 2015 $ / Mcf $ / Barrel	Mar. 31, 2015 $ / Mcf $ / Barrel
Oil [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Oil and natural gas prices | $ / Barrel	48.11	56.74	68.48	79.55
Natural Gas [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Oil and natural gas prices | $ / Mcf	2.45	3.64	3.74	3.95