Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 142,583	$ 145,459
Accounts receivable—net	37,162	82,953
Contract revenues in excess of billings	74,535	39,844
Inventories	30,394	30,760
Prepaid expenses and other current assets	43,368	28,416
Total current assets	328,042	327,432
PROPERTY AND EQUIPMENT—Net	468,555	455,102
OPERATING LEASE ASSETS	63,345	62,233
GOODWILL	76,576	76,576
INVENTORIES—Noncurrent	71,117	65,049
OTHER	11,204	11,278
TOTAL	1,018,839	997,670
LIABILITIES AND EQUITY
Accounts payable	98,182	85,566
Accrued expenses	33,949	37,626
Operating lease liabilities	16,036	16,729
Billings in excess of contract revenues	3,687	14,814
Total current liabilities	151,854	154,735
LONG-TERM DEBT	321,108	320,971
OPERATING LEASE LIABILITIES—Noncurrent	47,839	45,986
DEFERRED INCOME TAXES	73,888	68,497
OTHER	8,746	8,484
Total liabilities	603,435	598,673
COMMITMENTS AND CONTINGENCIES (Note 8)
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 66,046 and 65,746 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively.	6	6
Additional paid-in capital	307,597	308,482
Retained earnings	101,426	90,369
Accumulated other comprehensive income	6,375	140
Total equity	415,404	398,997
TOTAL	$ 1,018,839	$ 997,670