Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 40,190	$ 31,610
Accounts receivable, net of allowance for doubtful accounts of $1,195 in 2016 and 2017	16,494	29,682
Accrued revenue	218,621	261,960
Derivative instruments	452,005	73,022
Other current assets	8,573	6,313
Total current assets	735,883	402,587
Natural gas properties, at cost (successful efforts method):
Unproved properties	2,309,839	2,331,173
Proved properties	10,493,932	9,549,671
Water handling and treatment systems	840,183	744,682
Gathering systems and facilities	1,884,712	1,723,768
Other property and equipment	48,537	41,231
Property and equipment, gross	15,577,203	14,390,525
Less accumulated depletion, depreciation, and amortization	(2,767,358)	(2,363,778)
Property and equipment, net	12,809,845	12,026,747
Derivative instruments	1,600,165	1,731,063
Investments in unconsolidated affiliates	259,697	68,299
Other assets	36,631	26,854
Total assets	15,442,221	14,255,550
Current liabilities:
Accounts payable	51,567	38,627
Accrued liabilities	418,352	393,803
Revenue distributions payable	203,151	163,989
Derivative instruments	3,279	203,635
Other current liabilities	16,711	17,334
Total current liabilities	693,060	817,388
Long-term liabilities:
Long-term debt	5,291,973	4,703,973
Deferred income tax liability	1,100,382	950,217
Derivative instruments	172	234
Other liabilities	53,772	55,160
Total liabilities	7,139,359	6,526,972
Commitments and contingencies (notes 13 and 14)
Equity:
Common stock, $0.01 par value; authorized - 1,000,000 shares; issued and outstanding 314,877 shares and 315,448 shares, respectively	3,154	3,149
Additional paid-in capital	6,435,047	5,299,481
Accumulated earnings	1,223,259	959,995
Total stockholders' equity	7,661,460	6,262,625
Noncontrolling interest in consolidated subsidiary	641,402	1,465,953
Total equity	8,302,862	7,728,578
Total liabilities and equity	$ 15,442,221	$ 14,255,550