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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 4,306 $ 6,562
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and finance lease amortization 5,805 6,300
Amortization of intangible assets 631 972
Deferred income taxes 67 2,618
Gain on insurance proceeds 0 (1,018)
Share-based compensation expense 1,840 1,433
Other, net 286 128
Changes in operating assets and liabilities, net of acquired assets and assumed liabilities:    
Trade and other receivables 8,516 5,107
Contract assets, net (16,987) 9,978
Inventories (805) 902
Prepaid expenses and other assets 3,385 2,835
Accounts payable 1,962 (3,787)
Accrued and other liabilities (3,934) (3,243)
Net cash provided by operating activities 5,072 28,787
Cash flows from investing activities:    
Acquisition of business, net of cash acquired 0 (48,728)
Purchases of property and equipment (4,778) (6,494)
Proceeds from insurance 0 557
Other investing activities 101 0
Net cash used in investing activities (4,677) (54,665)
Cash flows from financing activities:    
Borrowings on line of credit 0 41,377
Repayments on line of credit 0 (41,377)
Borrowings on long-term debt 0 15,879
Payments on long-term debt (13,762) (529)
Payments of debt issuance costs 0 (454)
Payments on finance lease obligations (196) (208)
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 (15,124) 14,070
Change in cash and cash equivalents (14,729) (11,808)
Cash and cash equivalents, beginning of period 37,927 31,014
Cash and cash equivalents, end of period 23,198 19,206
Noncash investing and financing activities:    
Accrued property and equipment purchases 831 633
Right-of-use assets obtained in exchange for operating lease liabilities 4,669 1,837
Right-of-use assets obtained in exchange for finance lease liabilities $ 371 $ 0