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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 20,491 $ 15,565
Adjustments to reconcile net income to net cash (used in) provided by operating activities, net of acquisitions:    
Depreciation and amortization 7,188 5,827
Deferred income taxes 396 100
Stock-based compensation 4,764 2,525
Amortization of debt issuance costs under the credit facility 368 370
Provision for doubtful accounts 529 436
Loss (gain) of disposal of assets   352
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable (6,232) 23,342
Prepaid expenses and other current assets (3,004) (3,608)
Government stimulus advances (23,993)  
Accounts payable 111 (2,700)
Accrued payroll (1,900) (1,800)
Accrued expenses and other long-term liabilities (2,039) 10,478
Net cash (used in) provided by operating activities (3,321) 50,887
Cash flows from investing activities:    
Purchases of property and equipment (1,847) (4,842)
Acquisitions of businesses, net of cash acquired (81) (295)
Proceeds from disposal of assets   172
Net cash used in investing activities (1,928) (4,965)
Cash flows from financing activities:    
Payments on term loan — credit facility (490) (245)
Cash received from exercise of stock options 124 1,179
Other (63) (21)
Net cash (used in) provided by financing activities (429) 913
Net change in cash (5,678) 46,835
Cash, at beginning of period 145,078 111,714
Cash, at end of period 139,400 158,549
Supplemental disclosures of cash flow information:    
Cash paid for interest 2,136 992
Cash paid for income taxes $ 10,950 $ 6,414