Derivatives - Narrative (Details)		1 Months Ended	3 Months Ended
	May 23, 2016 USD ($) $ / bbl	Jan. 31, 2017 USD ($)	Mar. 31, 2017 USD ($) $ / bbl	Dec. 31, 2016 USD ($)
Rowan Relentless [Member]
Derivative [Line Items]
Contingent payments, period of evaluation	12 months		12 months
Revenue, fair value of derivative associated with early contract termination agreement	$ 6,200,000
Contingent Consideration Threshold 1 [Member] | Rowan Relentless [Member]
Derivative [Line Items]
Additional contingent payments	$ 10,000,000
Contingent payment, threshold price per barrel (in usd per bbl) | $ / bbl	50		50
Proceeds from customers		$ 6,000,000
Contingent Consideration Threshold 2 [Member] | Rowan Relentless [Member]
Derivative [Line Items]
Additional contingent payments	$ 20,000,000
Contingent payment, threshold price per barrel (in usd per bbl) | $ / bbl	65		65
Recurring Basis [Member]
Derivative [Line Items]
Contingent Payment Derivative			$ 0	$ 6,100,000