Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Statement of Cash Flows [Abstract]
Current period net (loss) income	$ (9,485)	$ 64,924
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Unrealized loss (gain) on derivatives	45,719	(10,416)
Depletion, depreciation and amortization	76,866	55,369
Accretion of asset retirement obligations	414	364
Stock-based compensation expense	4,587	4,179
Deferred income tax benefit	(1,013)	0
Amortization of debt issuance cost	643	365
Changes in operating assets and liabilities
Accounts receivable	(3,873)	3,268
Lease and well equipment inventory	(1,465)	(3,806)
Prepaid expenses	(936)	(674)
Other assets	9,809	(249)
Accounts payable, accrued liabilities and other current liabilities	(41,621)	15,184
Royalties payable	(7,500)	1,627
Advances from joint interest owners	(6,297)	6,063
Other long-term liabilities	(6,608)	(49)
Net cash provided by operating activities	59,240	136,149
Investing activities
Oil and natural gas properties capital expenditures	(182,288)	(183,422)
Midstream capital expenditures	33,340	36,806
Midstream capital expenditures	(807)	(526)
Proceeds from sale of assets	1,555	0
Net cash used in investing activities	(214,880)	(220,754)
Financing activities
Borrowings under Credit Agreement	100,000	0
Proceeds from stock options exercised	3,150	164
Contributions related to formation of San Mateo I	14,700	14,700
Contributions from non-controlling interest owners of less-than-wholly-owned subsidiaries	12,330	29,400
Distributions to non-controlling interest owners of less-than-wholly-owned subsidiaries	(8,330)	(4,900)
Taxes paid related to net share settlement of stock-based compensation	(3,208)	(4,458)
Cash paid under financing lease obligations	(274)	0
Net cash provided by financing activities	118,368	34,906
Decrease in cash and restricted cash	(37,272)	(49,699)
Cash and restricted cash at beginning of period	83,984	102,482
Cash and restricted cash at end of period	$ 46,712	$ 52,783

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 cash outflow for principal payment on finance lease.

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Amount of increase (decrease) in deferred obligations classified as other.

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The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods.

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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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