CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
CURRENT ASSETS:
Cash, cash equivalents and restricted cash	$ 53,555	$ 27,134
Accounts receivable, net of allowance of $1,065 in 2023 and $939 in 2022	215,581	301,622
Inventory	49,939	57,764
Prepaid supplies and other	26,626	31,956
TOTAL CURRENT ASSETS	345,701	418,476
Property and equipment, net	2,820,769	2,402,408
Customer incentive	60,961	79,650
Goodwill and acquired intangibles	482,427	492,642
Operating lease assets	54,060	74,070
Other assets	118,172	122,647
TOTAL ASSETS	3,882,090	3,589,893
CURRENT LIABILITIES:
Accounts payable	227,652	192,992
Accrued salaries, wages and benefits	56,650	56,498
Accrued expenses	10,784	12,466
Current portion of debt obligations	54,710	639
Current portion of lease obligations	20,167	23,316
Unearned revenue and grants	30,226	21,546
TOTAL CURRENT LIABILITIES	400,189	307,457
Long term debt	1,707,572	1,464,285
Stock obligations	1,729	695
Post-retirement obligations	19,368	35,334
Long term lease obligations	34,990	51,575
Other liabilities	64,292	62,861
Deferred income taxes	285,248	255,180
TOTAL LIABILITIES	2,513,388	2,177,387
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; 65,240,961 and 72,327,758 shares issued and outstanding in 2023 and 2022, respectively	652	723
Additional paid-in capital	836,270	986,303
Retained earnings	589,209	528,882
Accumulated other comprehensive loss	(57,429)	(103,402)
TOTAL STOCKHOLDERS’ EQUITY	1,368,702	1,412,506
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 3,882,090	$ 3,589,893