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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
OPERATING ACTIVITIES:      
Net income (loss) $ (34,055) $ 49,432 $ 66,103
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:      
Depreciation expense 46,273 43,016 38,183
Deferred income taxes (9,270) 12,311 20,508
(Gain) loss on sale of assets 7,792 (294) (1,571)
Amortization of deferred financing fees 1,299 2,349 1,611
Share-based compensation expense 4,288 5,188 6,754
Changes in assets and liabilities:      
Accounts receivable 38,064 (43,963) (19,205)
Contract revenues in excess of billings (26,078) (7,738) (9,546)
Inventories (14,255) (2,706) (2,383)
Prepaid expenses and other current assets (7,636) 10,873 1,466
Accounts payable and accrued expenses (1,966) (698) (3,328)
Billings in excess of contract revenues (4,900) (17,794) (22,658)
Other noncurrent assets and liabilities 2,097 (969) 3,013
Cash provided by operating activities 1,653 49,007 78,947
INVESTING ACTIVITIES:      
Purchases of property and equipment (143,006) (116,658) (47,621)
Proceeds from dispositions of property and equipment 2,100 4,459 4,450
Cash used in investing activities (140,906) (112,199) (43,171)
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 (1,827) (3,785) (4,748)
Exercise of stock options and purchases from employee stock plans 1,148 2,321 2,360
Repurchase of common stock     (3,873)
Borrowings under revolving loans 10,000    
Repayments of revolving loans (10,000)    
Cash used in financing activities (1,660) (5,859) (6,261)
Net (decrease) increase in cash, cash equivalents and restricted cash (140,913) (69,051) 29,515
Cash, cash equivalents and restricted cash at beginning of period 147,459 216,510 186,995
Cash, cash equivalents and restricted cash at end of period 6,546 147,459 216,510
Cash and cash equivalents 6,546 145,459 216,510
Restricted cash included in other long-term assets   2,000  
Supplemental Cash Flow Information      
Cash paid for interest 17,742 22,919 26,430
Cash paid for income taxes 1,264 637 392
Non-cash Investing and Financing Activities      
Property and equipment purchased but not yet paid $ 8,686 $ 7,010 $ 6,693