Commitments and Contingencies Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended		1 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014 Drilling Rig Leasing Contracts [Member]	Jul. 23, 2014 Subsequent Event [Member] Drilling Rig Leasing Contracts [Member]
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Amount			$ 91.5	$ 18.1
Document Period End Date		Jun. 30, 2014
Purchase Commitment, Remaining Minimum Amount Committed			71.2
Gain (Loss) Related to Litigation Settlement	$ 10.7