Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash, cash equivalents and restricted cash	$ 61,078	$ 46,201
Accounts receivable, net of allowance of $1,170 in 2020 and $975 in 2019	149,804	162,870
Inventory	39,638	37,397
Prepaid supplies and other	22,916	20,323
TOTAL CURRENT ASSETS	273,436	266,791
Property and equipment, net	1,904,940	1,766,020
Lease incentive	131,634	146,678
Other assets	80,591	68,733
Goodwill and acquired intangibles	519,079	527,654
Operating lease assets	53,151	44,302
Intangibles	123,105	131,680
Goodwill	395,974	395,974
TOTAL ASSETS	2,962,831	2,820,178
CURRENT LIABILITIES:
Accounts payable	142,173	141,094
Accrued salaries, wages and benefits	58,230	59,429
Accrued expenses	18,206	17,586
Current portion of debt obligations	13,742	14,707
Current portion of lease obligations	14,551	12,857
Unearned revenue and grants	65,832	17,566
TOTAL CURRENT LIABILITIES	312,734	263,239
Long term debt	1,466,844	1,469,677
Post-retirement obligations	22,946	36,744
Long term lease obligations	38,353	30,334
Other liabilities	49,814	49,293
Warrant liability	210,319	383,073
Deferred income taxes	147,201	127,476
TOTAL LIABILITIES	2,248,211	2,359,836
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; 59,589,770 and 59,329,431 shares issued and outstanding in 2020 and 2019, respectively	596	593
Additional paid-in capital	700,757	475,720
Retained earnings	72,883	45,895
Accumulated other comprehensive loss	(59,616)	(61,866)
TOTAL STOCKHOLDERS’ EQUITY	714,620	460,342
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 2,962,831	$ 2,820,178