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Litigation (Details) (USD $)
 0 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 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]
Loss Contingencies [Line Items]            
Potential liabilities related to litigation and environmental matters $ 31,900,000 $ 29,500,000 $ 30,800,000      
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  
Arbitration award           $ 26,600,000