Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash, cash equivalents and restricted cash	$ 60,253	$ 46,201
Accounts receivable, net of allowance of $1,515 in 2020 and $975 in 2019	166,547	162,870
Inventory	40,131	37,397
Prepaid supplies and other	20,944	20,323
TOTAL CURRENT ASSETS	287,875	266,791
Property and equipment, net	1,876,578	1,766,020
Lease incentive	136,924	146,678
Other assets	58,462	68,733
Goodwill and acquired intangibles	521,937	527,654
Operating lease assets	55,356	44,302
Intangibles	125,963	131,680
Goodwill	395,974	395,974
TOTAL ASSETS	2,937,132	2,820,178
CURRENT LIABILITIES:
Accounts payable	156,674	141,094
Accrued salaries, wages and benefits	57,205	59,429
Accrued expenses	17,901	17,586
Current portion of debt obligations	13,769	14,707
Current portion of lease obligations	14,902	12,857
Unearned revenue and grants	42,569	17,566
TOTAL CURRENT LIABILITIES	303,020	263,239
Long term debt	1,505,570	1,469,677
Post-retirement obligations	30,058	36,744
Long term lease obligations	40,082	30,334
Other liabilities	50,482	49,293
Stock Warrants	375,538	383,073
Deferred income taxes	135,849	127,476
TOTAL LIABILITIES	2,440,599	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	477,829	475,720
Retained earnings	78,474	45,895
Accumulated other comprehensive loss	(60,366)	(61,866)
TOTAL STOCKHOLDERS’ EQUITY	496,533	460,342
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 2,937,132	$ 2,820,178