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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
OPERATING ACTIVITIES:    
Net income $ 7,024 $ 10,919
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization 22,930 20,681
Deferred income taxes 2,432 2,218
Gain on sale of assets (318) (32)
Amortization of deferred financing fees 634 1,715
Share-based compensation expense 1,552 2,564
Changes in assets and liabilities:    
Accounts receivable 13,628 3,249
Contract revenues in excess of billings (22,771) (2,450)
Inventories (8,528) (1,233)
Prepaid expenses and other current assets (8,052) 4,131
Accounts payable and accrued expenses 3,906 (2,668)
Billings in excess of contract revenues (12,200) (3,775)
Other noncurrent assets and liabilities 609 282
Cash provided by operating activities 846 35,601
INVESTING ACTIVITIES:    
Purchases of property and equipment (71,701) (64,828)
Proceeds from dispositions of property and equipment 2,060 223
Cash used in investing activities (69,641) (64,605)
FINANCING ACTIVITIES:    
Deferred financing fees   (4,395)
Taxes paid on settlement of vested share awards (1,827) (3,784)
Exercise of options and purchases from employee stock plans 583 1,440
Cash used in financing activities (1,244) (6,739)
Net decrease in cash, cash equivalents and restricted cash (70,039) (35,743)
Cash, cash equivalents and restricted cash at beginning of period 147,459 216,510
Cash, cash equivalents and restricted cash at end of period 77,420 180,767
Cash and cash equivalents 75,420 180,767
Restricted cash included in other long-term assets 2,000  
Supplemental Cash Flow Information    
Cash paid for interest 8,808 13,984
Cash paid for income taxes 1,239 332
Non-cash Investing and Financing Activities    
Property and equipment purchased but not yet paid $ 13,921 $ 11,139