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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 175,756	$ 168,947	$ 520,177	$ 412,375
Services provided or goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	5,845	6,052	12,983	16,241
Recurring term contracts: Primary Term
Disaggregation of Revenue [Line Items]
Total revenues	114,121	84,620	316,809	199,027
Recurring term contracts: Month-to-month
Disaggregation of Revenue [Line Items]
Total revenues	55,790	78,275	190,385	197,107
Contract operations revenue
Disaggregation of Revenue [Line Items]
Total revenues	169,911	162,895	507,194	396,134
Retail parts and services revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 5,845	$ 6,052	$ 12,983	$ 16,241

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+ References

No definition available.

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- Definition

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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