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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
OPERATING ACTIVITIES:    
Net loss $ (7,652) $ (2,886)
Adjustments to reconcile net loss to net cash flows provided by operating activities:    
Depreciation and amortization 32,320 33,977
Deferred income taxes (1,804) (915)
Gain on sale of assets (296) (358)
Amortization of deferred financing fees 724 900
Share-based compensation expense 4,209 2,837
Changes in assets and liabilities:    
Accounts receivable 15,654 14,284
Contract revenues in excess of billings 16,632 (21,794)
Inventories (10,352) (13,642)
Prepaid expenses and other current assets (3,613) (8,038)
Accounts payable and accrued expenses (11,005) (1,607)
Billings in excess of contract revenues 19,478 (9,363)
Other noncurrent assets and liabilities (4,718) (46)
Cash provided by (used in) operating activities 49,577 (6,651)
INVESTING ACTIVITIES:    
Purchases of property and equipment (98,193) (102,568)
Proceeds from dispositions of property and equipment 1,215 2,100
Cash used in investing activities (96,978) (100,468)
FINANCING ACTIVITIES:    
Deferred financing fees   (828)
Taxes paid on settlement of vested share awards (603) (1,827)
Exercise of options and purchases from employee stock plans 551 1,148
Borrowing under revolving loans 120,000  
Repayments of revolving loans (65,000)  
Cash provided by (used in) financing activities 54,948 (1,507)
Net increase (decrease) in cash, cash equivalents and restricted cash 7,547 (108,626)
Cash, cash equivalents and restricted cash at beginning of period 6,546 147,459
Cash, cash equivalents and restricted cash at end of period 14,093 38,833
Supplemental Cash Flow Information    
Cash paid for interest 10,742 8,954
Cash paid for income taxes 281 1,265
Non-cash Investing and Financing Activities    
Property and equipment purchased but not yet paid $ 5,191 $ 11,123