Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 23,694	$ 31,610
Accounts receivable, net of allowance for doubtful accounts of $1,195 in 2016 and 2017	43,854	29,682
Accrued revenue	233,585	261,960
Derivative instruments	299,796	73,022
Other current assets	10,024	6,313
Total current assets	610,953	402,587
Natural gas properties, at cost (successful efforts method):
Unproved properties	2,305,749	2,331,173
Proved properties	10,779,043	9,549,671
Water handling and treatment systems	891,869	744,682
Gathering systems and facilities	1,977,510	1,723,768
Other property and equipment	54,571	41,231
Property and equipment, gross	16,008,742	14,390,525
Less accumulated depletion, depreciation, and amortization	(2,973,544)	(2,363,778)
Property and equipment, net	13,035,198	12,026,747
Derivative instruments	876,293	1,731,063
Investments in unconsolidated affiliates	287,842	68,299
Other assets	38,928	26,854
Total assets	14,849,214	14,255,550
Current liabilities:
Accounts payable	47,457	38,627
Accrued liabilities	429,696	393,803
Revenue distributions payable	220,971	163,989
Derivative instruments	4,285	203,635
Other current liabilities	15,267	17,334
Total current liabilities	717,676	817,388
Long-term liabilities:
Long-term debt	4,510,521	4,703,973
Deferred income tax liability	1,180,564	950,217
Derivative instruments	427	234
Other liabilities	52,764	55,160
Total liabilities	6,461,952	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	3,155	3,149
Additional paid-in capital	6,564,320	5,299,481
Accumulated earnings	1,088,196	959,995
Total stockholders' equity	7,655,671	6,262,625
Noncontrolling interest in consolidated subsidiary	731,591	1,465,953
Total equity	8,387,262	7,728,578
Total liabilities and equity	$ 14,849,214	$ 14,255,550