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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net income $ 32,068 $ 24,684
Adjustments to reconcile net income to net cash provided by operating activities, net of acquisitions:    
Depreciation and amortization 10,594 8,872
Deferred income taxes 605 51
Stock-based compensation 7,105 3,987
Amortization of debt issuance costs under the credit facility 590 554
Provision for doubtful accounts 744 681
Loss (gain) of disposal of assets and asset impairment   1,242
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable (1,906) 30,746
Prepaid expenses and other current assets (3,610) (2,592)
Government stimulus advances (24,413) 7,141
Accounts payable (780) (2,496)
Accrued payroll (4,553) (4,567)
Accrued expenses and other long-term liabilities (2,157) 4,996
Net cash provided by operating activities 14,287 73,299
Cash flows from investing activities:    
Purchases of property and equipment (3,214) (5,893)
Acquisitions of businesses, net of cash acquired (29,219) (11,869)
Proceeds from disposal of assets   255
Net cash used in investing activities (32,433) (17,507)
Cash flows from financing activities:    
Borrowings on revolver — credit facility 46,395  
Payments on term loan — credit facility (18,130) (490)
Payments for debt issuance costs (3,020)  
Cash received from exercise of stock options 202 3,337
Other   (22)
Net cash provided by financing activities 25,447 2,825
Net change in cash 7,301 58,617
Cash, at beginning of period 145,078 111,714
Cash, at end of period 152,379 170,331
Supplemental disclosures of cash flow information:    
Cash paid for interest 3,648 1,869
Cash paid for income taxes $ 14,767 $ 9,119