Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Current period net (loss) income	$ 35,587	$ 130,561
Adjustments to reconcile net income to net cash provided by operating activities
Unrealized loss (gain) on derivatives	39,562	(11,845)
Depletion, depreciation and amortization	156,999	122,207
Accretion of asset retirement obligations	834	739
Stock-based compensation expense	9,076	8,945
Deferred income tax provision	11,845	0
Amortization of debt issuance cost	1,189	411
Inventory impairment	(368)	0
Changes in operating assets and liabilities
Accounts receivable	(378)	(9,321)
Lease and well equipment inventory	(3,456)	(8,611)
Prepaid expenses	(4,834)	(2,167)
Other assets	(415)	(149)
Accounts payable, accrued liabilities and other current liabilities	(48,746)	(883)
Royalties payable	1,353	8,393
Advances from joint interest owners	(6,243)	16,025
Other long-term liabilities	1,756	(97)
Net cash provided by operating activities	194,497	254,208
Investing activities
Oil and natural gas properties capital expenditures	(349,915)	(421,595)
Midstream capital expenditures	64,106	78,302
Midstream capital expenditures	(2,206)	(1,258)
Proceeds from sale of assets	21,533	7,593
Net cash used in investing activities	(394,694)	(493,562)
Financing activities
Repayments of borrowings	0	45,000
Borrowings under Credit Agreement	165,000	45,000
Borrowings under San Mateo Credit Facility	20,000	0
Cost to amend credit facilities	(415)	0
Proceeds from issuance of common stock	0	226,612
Cost to issue equity	0	73
Contributions related to formation of San Mateo I	14,700	14,700
Proceeds from stock options exercised	3,298	464
Contributions from non-controlling interest owners of less-than-wholly-owned subsidiaries	19,831	53,900
Distributions to non-controlling interest owners of less-than-wholly-owned subsidiaries	(17,640)	(10,535)
Taxes paid related to net share settlement of stock-based compensation	(3,309)	(4,683)
Cash paid under financing lease obligations	(490)	0
Net cash provided by financing activities	200,975	280,385
Increase in cash and restricted cash	778	41,031
Cash and restricted cash at beginning of period	83,984	102,482
Cash and restricted cash at end of period	$ 84,762	$ 143,513

The increase (decrease) in payments made in advance by joint interest partners in oil and gas properties.

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Payments To Acquire Midstream Capital Expenditures

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period in the obligations due for compensation payments related to the use of copyrights, patents, trade names, licenses, technology. Royalty payments are also paid by the lease holders for oil, gas, and mineral extraction.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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