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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Total revenues	$ 584,352	$ 276,671	$ 263,937
Services provided or goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	20,936	10,541	8,377
Recurring term contracts: Primary Term
Disaggregation of Revenue [Line Items]
Total revenues	288,299	128,864	158,313
Recurring term contracts: Month-to-month
Disaggregation of Revenue [Line Items]
Total revenues	275,117	137,266	97,247
Contract operations revenue
Disaggregation of Revenue [Line Items]
Total revenues	563,416	266,130	255,560
Retail parts and services revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 20,936	$ 10,541	$ 8,377

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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