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Fair Value Measurements - Assumptions (Details)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Rig count volatility	1.85%
Cost of debt	5.31%

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- Definition

Fair Value Assumptions, Rig Count Forecasts, Cost of Debt

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Fair Value Assumptions, Rig Count Forecasts, Expected Volatility Rate

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