Litigation (Details) (USD $)					0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Aug. 31, 2011 Litigation related to construction materials [Member]	Aug. 06, 2012 Former employee litigation [Member]	Oct. 31, 2010 Natural gas gathering operations [Member]	Jan. 13, 2012 Guarantee obligation under construction contract [Member]	Dec. 31, 2009 Guarantee obligation under construction contract [Member]
Loss Contingencies [Line Items]
Potential liabilities related to litigation and environmental matters	$ 32,100,000	$ 29,500,000	$ 32,900,000
Amount of compensatory damages in LPP's notice of demand								149,700,000
Arbitration award						26,600,000	22,000,000
Loss contingency, estimate of possible loss				3,700,000
Additional amount per day of potential penalties				5,000
Plaintiffs request compensatory damages					$ 23,800,000