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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
OPERATING ACTIVITIES:      
Net income (loss) $ 13,906 $ (34,055) $ 49,432
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:      
Depreciation expense 42,525 46,273 43,016
Deferred income taxes 3,733 (9,270) 12,311
(Gain) loss on sale of assets (485) 7,792 (294)
Amortization of deferred financing fees 965 1,299 2,349
Share-based compensation expense 6,316 4,288 5,188
Changes in assets and liabilities:      
Accounts receivable (9,921) 38,064 (43,963)
Contract revenues in excess of billings (2,813) (26,078) (7,738)
Inventories (11,000) (14,255) (2,706)
Prepaid expenses and other current assets (10,250) (7,636) 10,873
Accounts payable and accrued expenses 1,376 (1,966) (698)
Billings in excess of contract revenues 19,647 (4,900) (17,794)
Other noncurrent assets and liabilities (6,574) 2,097 (969)
Cash provided by operating activities 47,425 1,653 49,007
INVESTING ACTIVITIES:      
Purchases of property and equipment (150,840) (143,006) (116,658)
Proceeds from dispositions of property and equipment 30,699 2,100 4,459
Cash used in investing activities (120,141) (140,906) (112,199)
FINANCING ACTIVITIES:      
Repayments of debt     (325,000)
Proceeds from issuance of debt     325,000
Deferred financing fees   (981) (4,395)
Taxes paid on settlement of vested share awards (1,019) (1,827) (3,785)
Exercise of stock options and purchases from employee stock plans 1,034 1,148 2,321
Borrowings under revolving loans 208,000 10,000  
Repayments of revolving loans (118,000) (10,000)  
Payments on finance lease obligations (84)    
Cash provided by (used in) financing activities 89,931 (1,660) (5,859)
Net (decrease) increase in cash, cash equivalents and restricted cash 17,215 (140,913) (69,051)
Cash, cash equivalents and restricted cash at beginning of period 6,546 147,459 216,510
Cash, cash equivalents and restricted cash at end of period 23,761 6,546 147,459
Cash and cash equivalents 22,841 6,546 145,459
Restricted cash included in other long-term assets 920   2,000
Supplemental Cash Flow Information      
Cash paid for interest 20,738 17,742 22,919
Cash paid for income taxes 132 1,264 637
Non-cash Investing and Financing Activities      
Property and equipment purchased but not yet paid $ 6,000 $ 8,686 $ 7,010