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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net income $ 9,252 $ 13,829
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and finance lease amortization 8,358 9,332
Amortization of intangible assets 947 1,607
Deferred income taxes (89) 5,025
Gain on insurance proceeds 0 (1,147)
Share-based compensation expense 2,437 2,306
Other, net 106 869
Changes in operating assets and liabilities, net of acquired assets and assumed liabilities:    
Trade and other receivables 3,181 (354)
Contract assets, net (35,055) 8,298
Inventories (13,813) 4,382
Prepaid expenses and other assets 6,383 3,787
Accounts payable 6,725 (3,343)
Accrued and other liabilities (2,057) (1,201)
Net cash provided by (used in) operating activities (13,625) 43,390
Cash flows from investing activities:    
Acquisition of business, net of cash acquired 0 (48,728)
Purchases of property and equipment (8,126) (9,787)
Purchases of intangible assets 0 (327)
Proceeds from insurance 0 1,637
Other investing activities 304 0
Net cash used in investing activities (7,822) (57,205)
Cash flows from financing activities:    
Borrowings on line of credit 4,720 41,377
Repayments on line of credit (2,567) (41,377)
Borrowings on long-term debt 0 15,879
Payments on long-term debt (13,762) (1,323)
Payments of debt issuance costs (220) (461)
Payments on finance lease obligations (297) (313)
Tax withholdings related to net share settlements of restricted stock and performance share awards (1,166) (618)
Net cash provided by (used in) financing activities (13,292) 13,164
Change in cash and cash equivalents (34,739) (651)
Cash and cash equivalents, beginning of period 37,927 31,014
Cash and cash equivalents, end of period 3,188 30,363
Noncash investing and financing activities:    
Accrued property and equipment purchases 756 876
Right-of-use assets obtained in exchange for operating lease liabilities 4,669 4,471
Right-of-use assets obtained in exchange for finance lease liabilities $ 855 $ 0