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Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 501,337	$ 254,091	$ 922,553	$ 539,207
Exploration and Production [Member]
Disaggregation of Revenue [Line Items]
Total revenues	450,124	226,724	831,832	491,607
Exploration and Production [Member] | Oil Production [Member]
Disaggregation of Revenue [Line Items]
Total revenues	361,254	194,005	684,640	402,599
Exploration and Production [Member] | Purchased Oil Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	53,707	7,905	71,695	35,536
Exploration and Production [Member] | Natural Gas, Production [Member]
Disaggregation of Revenue [Line Items]
Total revenues	23,059	15,119	50,021	34,652
Exploration and Production [Member] | Purchased Gas Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	496	186	545	186
Exploration and Production [Member] | Natural Gas Liquid Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	11,608	9,509	24,931	18,634
Midstream Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	32,717	15,566	60,639	30,172
Midstream Services [Member] | Purchased Oil Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	3,375	0	3,375	0
Midstream Services [Member] | Crude Oil and Natural Gas Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	17,907	3,187	35,936	11,739
Midstream Services [Member] | Water Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	11,435	12,379	21,328	18,433
Well Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	18,496	11,801	30,082	17,428
Well Services [Member] | Hydraulic Fracturing Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	17,390	11,057	27,816	16,213
Well Services [Member] | Equipment Rental Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,106	$ 744	$ 2,266	$ 1,215

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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