The amount of adjusted gross profit for the period.

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Percentage of revenue generated from external customers.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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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.

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Business Segments (Details) $ in Thousands	3 Months Ended								12 Months Ended
Business Segments (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($) segment
Business segments
Number of reportable segments \| segment									4	3
Number of operating segments \| segment									4	6
Percentage of revenue generated									75.00%
Total Revenue	$ 51,610	$ 48,263	$ 53,620	$ 71,655	$ 76,113	$ 81,643	$ 81,358	$ 81,982	$ 225,148	$ 321,096	$ 240,600
Adjusted gross profit									107,819	189,198	135,932
Total Assets	534,237				600,792				534,237	600,792
Operating Segments
Business segments
Total Revenue									225,148	321,096	240,600
Adjusted gross profit									107,120	190,434	137,164
Total Assets	363,544				406,274				363,544	406,274
Permian Basin \| Operating Segments
Business segments
Total Revenue									112,126	214,464	120,590
Adjusted gross profit									51,518	128,424	73,795
Capital expenditures									8,160	82,031	68,724
Total Assets	277,839				305,701				277,839	305,701
Bakken Basin \| Operating Segments
Business segments
Total Revenue									6,605	20,620	25,813
Adjusted gross profit									161	8,511	10,554
Capital expenditures									67	190	6,375
Total Assets	51,782				59,134				51,782	59,134
Government \| Operating Segments
Business segments
Total Revenue									63,259	66,972	66,676
Adjusted gross profit									47,523	49,203	47,437
Capital expenditures									24	305	5,068
Total Assets	27,149				35,484				27,149	35,484
TCPL Keystone \| Operating Segments
Business segments
Total Revenue									41,911	15,744	23,211
Adjusted gross profit									8,617	3,060	$ 4,146
Capital expenditures									164	3,379
Total Assets	3,543				3,379				$ 3,543	$ 3,379
All Other
Business segments
Number of operating segments \| segment									2	2	2
Total Assets	3,231				2,648				$ 3,231	$ 2,648
All Other \| Operating Segments
Business segments
Total Revenue									1,247	3,296	$ 4,310
Adjusted gross profit									(699)	1,236	1,232
Capital expenditures									656		$ 1,388
Total Assets	$ 3,231				$ 2,576				$ 3,231	$ 2,576