CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents		$ 448	$ 314
Accounts receivable, less allowance for doubtful accounts of $7,111 and $5,559		348,833	241,718
Derivative assets		58,607	13,278
Inventory and other		21,346	26,573
Total current assets		429,234	281,883
Derivative assets		273	205
Goodwill		1,641,197	1,654,292
Natural gas and oil properties, successful efforts method	[1]	13,216,453	12,386,153
Accumulated depletion and depreciation	[1]	(3,649,716)	(3,129,816)
Natural gas and oil properties, successful efforts method, net	[1]	9,566,737	9,256,337
Other property and equipment		114,361	112,796
Accumulated depreciation and amortization		(99,695)	(95,923)
Other Property and equipment, net		14,666	16,873
Other assets		76,734	72,655
Total assets		11,728,841	11,282,245
Current liabilities:
Accounts payable		343,871	229,190
Asset retirement obligations		6,327	7,271
Accrued liabilities		317,531	265,843
Accrued interest		43,511	35,340
Derivative liabilities		44,233	165,009
Total current liabilities		755,473	702,653
Bank debt		1,208,467	876,428
Senior notes		2,851,754	2,848,591
Senior subordinated notes		48,585	48,498
Deferred tax liabilities		693,356	943,343
Derivative liabilities		9,789	24,491
Deferred compensation liabilities		101,102	119,231
Asset retirement obligations and other liabilities		286,043	310,642
Total liabilities		5,954,569	5,873,877
Commitments and contingencies
Stockholders' Equity
Preferred stock, $1 par 10,000,000 shares authorized, none issued and outstanding		0	0
Common stock, $0.01 par 475,000,000 shares authorized, 248,144,397 issued at December 31, 2017 and 247,174,903 issued at December 31, 2016		2,481	2,471
Common stock held in treasury, 14,967 shares at December 31, 2017 and 30,547 shares at December 31, 2016		(599)	(1,209)
Additional paid-in capital		5,577,732	5,524,423
Accumulated other comprehensive loss		(1,332)	0
Retained earnings (deficit)		195,990	(117,317)
Total stockholders' equity		5,774,272	5,408,368
Total liabilities and stockholders' equity		$ 11,728,841	$ 11,282,245

[1] Includes capitalized asset retirement costs and the associated accumulated amortization.