Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash, cash equivalents and restricted cash	$ 51,659	$ 39,719
Accounts receivable, net of allowance of $1,005 in 2021 and $997 in 2020	155,115	153,511
Inventory	43,051	40,410
Prepaid supplies and other	35,352	39,096
TOTAL CURRENT ASSETS	285,177	272,736
Property and equipment, net	1,987,082	1,939,776
Lease incentive	120,308	126,007
Other assets	77,554
Goodwill and acquired intangibles	513,646	516,290
Operating lease assets	63,946	68,824
Intangibles		120,316
Goodwill		395,974
TOTAL ASSETS	3,047,713	3,001,745
CURRENT LIABILITIES:
Accounts payable	146,112	141,425
Accrued salaries, wages and benefits	46,157	56,506
Accrued expenses	17,505	19,005
Current portion of debt obligations	619	13,746
Current portion of lease obligations	16,781	17,784
Unearned revenue and grants	50,458	53,522
TOTAL CURRENT LIABILITIES	277,632	301,988
Long term debt	1,497,211	1,465,331
Post-retirement obligations	30,057	35,099
Long term lease obligations	47,317	51,128
Other liabilities	44,970	47,963
Stock Warrants	96,536	103,474
Deferred income taxes	154,252	141,265
TOTAL LIABILITIES	2,147,975	2,146,248
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; 60,641,436 and 59,560,036 shares issued and outstanding in 2021 and 2020, respectively	606	596
Additional paid-in capital	856,090	855,547
Retained earnings	120,300	78,010
Accumulated other comprehensive loss	(77,258)	(78,656)
TOTAL STOCKHOLDERS’ EQUITY	899,738	855,497
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 3,047,713	$ 3,001,745