Consolidated Balance Sheets - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 2,282,000	$ 2,282,000
Accounts receivable, net	98,444,000	99,723,000
Derivative assets, current	13,621,000	39,904,000
Other current assets	9,472,000	8,460,000
Total current assets	123,819,000	150,369,000
Oil and gas properties, full cost method
Proved properties, net	2,587,341,000	2,333,470,000
Unproved properties, not being amortized	656,976,000	673,833,000
Other property and equipment, net	11,188,000	11,221,000
Total property and equipment, net	3,255,505,000	3,018,524,000
Deferred income tax asset, noncurrent	177,723,000	0
Operating lease right-of-use assets	64,615,000	0
Other long-term assets	13,666,000	16,207,000
Total Assets	3,635,328,000	3,185,100,000
Current liabilities
Accounts payable	102,943,000	98,811,000
Revenues and royalties payable	54,662,000	49,003,000
Accrued capital expenditures	74,005,000	60,004,000
Accrued interest	18,700,000	18,377,000
Derivative liabilities	64,751,000	55,205,000
Operating lease liabilities	34,049,000	0
Other current liabilities	51,430,000	40,609,000
Total current liabilities	400,540,000	322,009,000
Long-term debt	1,731,418,000	1,633,591,000
Asset retirement obligations	22,111,000	18,360,000
Operating lease liabilities	36,526,000	0
Deferred income tax liabilities, noncurrent	8,218,000	8,017,000
Other long-term liabilities	20,101,000	47,797,000
Liabilities	2,218,914,000	2,029,774,000
Preferred stock, $0.01 par value, 10,000,000 shares authorized; 200,000 issued and outstanding as of June 30, 2019 and December 31, 2018	176,056,000	174,422,000
Shareholders’ equity
Common stock, $0.01 par value, 180,000,000 shares authorized; 92,552,930 issued and outstanding as of June 30, 2019 and 91,627,738 issued and outstanding as of December 31, 2018	926,000	916,000
Additional paid-in capital	2,132,131,000	2,131,535,000
Accumulated deficit	(892,699,000)	(1,151,547,000)
Total shareholders’ equity	1,240,358,000	980,904,000
Total Liabilities and Shareholders’ Equity	$ 3,635,328,000	$ 3,185,100,000