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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities    
Net income $ 41,325 $ 27,753
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization of property and equipment 20,623 18,614
Amortization of operating lease right-of-use assets 8,545 7,607
Amortization of intangibles 13,404 11,909
Amortization of deferred financing costs and debt discount 670 564
Provision for credit losses 2,668 1,605
Gain on sale of property and equipment (144) (156)
Noncash stock compensation 5,415 4,345
Deferred income taxes (1,679)  
Changes in assets and liabilities, excluding effects of acquisitions    
Accounts receivable (3,158) (17,876)
Inventories 6,072 (1,650)
Other assets 9,351 (1,495)
Accounts payable (18,504) (1,253)
Income taxes receivable/payable 16,015 6,347
Other liabilities 4,922 (3,914)
Net cash provided by operating activities 105,525 52,400
Cash flows from investing activities    
Purchases of investments (776) (17,352)
Maturities of short term investments 22,050 17,560
Purchases of property and equipment (16,345) (17,778)
Acquisitions of businesses (12,625) (21,290)
Proceeds from sale of property and equipment 314 452
Other (1,340) (876)
Net cash used in investing activities (8,722) (39,284)
Cash flows from financing activities    
Payments on term loan   (2,000)
Proceeds from vehicle and equipment notes payable 12,768 13,783
Debt issuance costs (157)  
Principal payments on long-term debt (13,205) (9,751)
Principal payments on finance lease obligations (1,392) (2,481)
Acquisition-related obligations (3,486) (5,039)
Repurchase of common stock (15,759)  
Surrender of common stock awards by employees (973) (2,323)
Net cash used in financing activities (22,204) (7,811)
Net change in cash and cash equivalents 74,599 5,305
Cash and cash equivalents at beginning of period 177,889 90,442
Cash and cash equivalents at end of period 252,488 95,747
Supplemental disclosures of cash flow information Net cash paid during the period for:    
Interest 13,006 11,793
Income taxes, net of refunds 476 3,595
Supplemental disclosure of noncash activities    
Right-of-use assets obtained in exchange for operating lease obligations 10,229 8,677
Property and equipment obtained in exchange for finance lease obligations 600 1,830
Seller obligations in connection with acquisition of businesses 4,037 3,162
Unpaid purchases of property and equipment included in accounts payable $ 1,981 $ 2,334