UNAUDITED CONDENSED COMBINED STATEMENTS OF CASH FLOWS - Predecessor - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income	$ 36,222	$ 37,804
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	2,007	1,917
Deferred income taxes	383	797
Stock-based compensation	188	177
Loss (Gain) due to changes in fair value of allowance oil receivable	108	(285)
Gain from disposition of property, plant and equipment, net	(6)	0
Changes in operating assets and liabilities
Accounts receivable - third parties	241	62
Accounts receivable - related parties	(4,362)	1,307
Allowance oil receivable	(842)	204
Prepaid expenses and other current assets	(44)	0
Accounts payable - third parties	152	99
Accounts payable - related parties	86	(36)
Accrued liabilities	(66)	(77)
Long-term portion of environmental remediation obligation	358	(340)
Other long-term liabilities	(162)	0
Net cash provided by operating activities	34,263	41,629
Cash flows from investing activities
Capital expenditures	(2,063)	(2,339)
Proceeds from disposition of property, plant and equipment, net	6	0
Net cash used in investing activities	(2,057)	(2,339)
Cash flows from financing activities
Net transfers to Parent	(32,206)	(39,290)
Net cash provided by financing activities	(32,206)	(39,290)
Net change in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of the period	0	0
Cash and cash equivalents at end of the period	0	0
Non-cash investing transactions
Change in accrued capital expenditures	$ (1,278)	$ (494)