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Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Statement of Cash Flows [Abstract]    
Current period net income $ 155,676 $ 95,566
Adjustments to reconcile net income to net cash provided by operating activities    
Unrealized loss (gain) on derivatives 9,492 (21,449)
Depletion, depreciation and amortization 192,664 123,066
Accretion of asset retirement obligations 1,126 937
Stock-based compensation expense 13,787 12,488
Prepayment premium on extinguishment of debt 31,226 0
Amortization of debt issuance cost 851 103
Net loss (gain) on asset sales and inventory impairment 196 (23)
Changes in operating assets and liabilities    
Accounts receivable (5,654) (50,343)
Lease and well equipment inventory (15,347) (1,666)
Prepaid expenses (502) (2,224)
Other assets 0 217
Accounts payable, accrued liabilities and other current liabilities 20,823 35,068
Royalties payable 5,665 29,651
Advances from joint interest owners 9,565 2,646
Other long-term liabilities (250) (1,521)
Net cash provided by operating activities 419,318 222,516
Investing activities    
Oil and natural gas properties capital expenditures (1,106,556) (517,270)
Expenditures for midstream and other property and equipment (122,239) (80,560)
Proceeds from sale of assets 8,267 977
Net cash used in investing activities (1,220,528) (596,853)
Financing activities    
Repayments of borrowings 45,000 0
Borrowings under Credit Agreement 370,000 0
Proceeds from issuance of senior unsecured notes 750,000 0
Cost to issue senior unsecured notes 9,531 0
Purchase of senior unsecured notes (605,780) 0
Proceeds from issuance of common stock 226,612 0
Cost to issue equity 146 0
Proceeds from stock options exercised 827 2,920
Contributions related to formation of Joint Venture 14,700 171,500
Contributions from non-controlling interest owners of less-than-wholly-owned subsidiaries 73,500 29,400
Distributions to non-controlling interest owners of less-than-wholly-owned subsidiaries (17,395) (5,635)
Taxes paid related to net share settlement of stock-based compensation (6,051) (4,415)
Purchase of non-controlling interest of less-than-wholly-owned subsidiary 0 (2,653)
Net cash provided by financing activities 751,736 191,117
Decrease in cash and restricted cash (49,474) (183,220)
Cash and restricted cash at beginning of period 102,482 214,142
Cash and restricted cash at end of period $ 53,008 $ 30,922