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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
OPERATING ACTIVITIES:    
Net income (loss) $ (1,498) $ 7,024
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:    
Depreciation and amortization 21,787 22,930
Deferred income taxes 5 2,432
Gain on sale of assets (261) (318)
Amortization of deferred financing fees 483 634
Share-based compensation expense 2,435 1,552
Changes in assets and liabilities:    
Accounts receivable 2,960 13,628
Contract revenues in excess of billings 22,717 (22,771)
Inventories (5,378) (8,528)
Prepaid expenses and other current assets 6,161 (8,052)
Accounts payable and accrued expenses (26,268) 3,906
Billings in excess of contract revenues 14,052 (12,200)
Other noncurrent assets and liabilities (3,098) 609
Cash provided by operating activities 34,097 846
INVESTING ACTIVITIES:    
Purchases of property and equipment (54,777) (71,701)
Proceeds from dispositions of property and equipment 1,180 2,060
Cash used in investing activities (53,597) (69,641)
FINANCING ACTIVITIES:    
Taxes paid on settlement of vested share awards (542) (1,827)
Exercise of options and purchases from employee stock plans 562 583
Borrowing under revolving loans 80,000  
Repayments of revolving loans (25,000)  
Cash provided by (used in) financing activities 55,020 (1,244)
Net increase (decrease) in cash, cash equivalents and restricted cash 35,520 (70,039)
Cash, cash equivalents and restricted cash at beginning of period 6,546 147,459
Cash, cash equivalents and restricted cash at end of period 42,066 77,420
Cash and cash equivalents 42,066 75,420
Restricted cash included in other long-term assets   2,000
Supplemental Cash Flow Information    
Cash paid for interest 9,957 8,808
Cash paid (received) for income taxes 258 1,239
Non-cash Investing and Financing Activities    
Property and equipment purchased but not yet paid $ 1,965 $ 13,921