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Commitments and Contingencies Operating Leases (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jul. 26, 2013
Tyler Lease and Access Agreement [Member]
Feb. 10, 2014
El Dorado Lease and Access Agreement [Member]
Related Party Transaction [Line Items]            
Operating Leases, Rent Expense $ 0.2 $ 0.2 $ 0.4 $ 0.4    
Operating Lease Term (years)         50 years 50 years