CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash, cash equivalents and restricted cash	$ 27,134	$ 69,496
Accounts receivable, net of allowance of $939 in 2022 and $742 in 2021	301,622	205,399
Inventory	57,764	49,204
Prepaid supplies and other	31,956	28,742
TOTAL CURRENT ASSETS	418,476	352,841
Property and equipment, net	2,402,408	2,129,934
Customer incentive	79,650	102,913
Goodwill and acquired intangibles	492,642	505,125
Operating lease assets	74,070	62,644
Other assets	122,647	113,878
TOTAL ASSETS	3,589,893	3,267,335
CURRENT LIABILITIES:
Accounts payable	192,992	174,237
Accrued salaries, wages and benefits	56,498	56,652
Accrued expenses	12,466	14,950
Current portion of debt obligations	639	628
Current portion of lease obligations	23,316	18,783
Unearned revenue and grants	21,546	47,381
TOTAL CURRENT LIABILITIES	307,457	312,631
Long term debt	1,464,285	1,298,735
Stock warrant obligations	695	915
Post-retirement obligations	35,334	21,337
Long term lease obligations	51,575	44,387
Other liabilities	62,861	49,662
Deferred income taxes	255,180	217,291
TOTAL LIABILITIES	2,177,387	1,944,958
Commitments and contingencies (Note H)
STOCKHOLDERS’ EQUITY:
Preferred stock, 20,000,000 shares authorized, including 75,000 Series A Junior Participating Preferred Stock	0	0
Common stock, par value $0.01 per share; 150,000,000 shares authorized; 72,327,758 and 74,142,183 shares issued and outstanding in 2022 and 2021, respectively	723	741
Additional paid-in capital	986,303	1,074,286
Retained earnings	528,882	309,430
Accumulated other comprehensive loss	(103,402)	(62,080)
TOTAL STOCKHOLDERS’ EQUITY	1,412,506	1,322,377
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 3,589,893	$ 3,267,335