Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended	1 Months Ended
	Jun. 30, 2013	Sep. 30, 2014	Dec. 31, 2013 BMT O&G TX, L.P. [Member]	Oct. 31, 2013 BMT O&G TX, L.P. [Member]	Jun. 30, 2013 Environmental Remediation Case 2001 [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value		$ 8
Loss contingency settlement amount	0.8			2.9
Minimum percentage of plaintiffs if opt out the settlement can be terminated					25.00%
Loss contingency, settlement amount paid	0.7
Attorney fees				0.8
Loss related to litigation settlement			$ 1.4