Commitments and Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 bbl	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2008
Commitments and Contingencies [Abstract]
Operating Leases, Rent Expense	$ 7.5	$ 2.4	$ 1.8
Long-term Purchase Commitment, Amount	40.5
Long-term Purchase Commitment, Time Period	four
Restricted escrow funds' trust				15.0
Misallocated oil volumes	74,000
Value of misallocated oil volumes	6.9
Restricted escrow trust funds including accumulated interest					16.7
Escrow Deposit	$ 6.0