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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
OPERATING ACTIVITIES:    
Net income (loss) $ (3,231) $ 11,057
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:    
Depreciation and amortization 10,850 11,316
Deferred income taxes (791) 3,285
Gain on sale of assets (18) (321)
Amortization of deferred financing fees 241 317
Share-based compensation expense 237 552
Changes in assets and liabilities:    
Accounts receivable 13,344 45,791
Contract revenues in excess of billings (15,379) (34,691)
Inventories (3,766) (5,703)
Prepaid expenses and other current assets 2,981 (6,612)
Accounts payable and accrued expenses 4,000 12,247
Billings in excess of contract revenues 2,530 (11,126)
Other noncurrent assets and liabilities (1,678) 205
Cash provided by operating activities 9,320 26,317
INVESTING ACTIVITIES:    
Purchases of property and equipment (33,629) (28,866)
Proceeds from dispositions of property and equipment 55 1,110
Cash used in investing activities (33,574) (27,756)
FINANCING ACTIVITIES:    
Taxes paid on settlement of vested share awards (335) (1,827)
Exercise of options and purchases from employee stock plans 562 390
Borrowing under revolving loans 75,000  
Repayments of revolving loans (25,000)  
Cash provided by (used in) financing activities 50,227 (1,437)
Net increase (decrease) in cash, cash equivalents and restricted cash 25,973 (2,876)
Cash, cash equivalents and restricted cash at beginning of period 6,546 147,459
Cash, cash equivalents and restricted cash at end of period 32,519 144,583
Cash and cash equivalents 32,519 142,583
Restricted cash included in other long-term assets   2,000
Supplemental Cash Flow Information    
Cash paid for interest 536 100
Cash paid (received) for income taxes (45) 58
Non-cash Investing and Financing Activities    
Property and equipment purchased but not yet paid $ 3,755 $ 10,319