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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities    
Net income $ 8,834 $ 6,394
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization of property and equipment 9,111 7,978
Amortization of operating lease right-of-use assets 3,798  
Amortization of intangibles 5,888 7,128
Amortization of deferred financing costs and debt discount 282 302
Provision for doubtful accounts 828 896
Gain on sale of property and equipment (19) (185)
Noncash stock compensation 2,022 2,240
Changes in assets and liabilities, excluding effects of acquisitions    
Accounts receivable (3,704) (7,058)
Inventories 799 (2,420)
Other assets (1,048) (4,139)
Accounts payable (7,807) (57)
Income taxes receivable / payable 2,746 1,303
Other liabilities (5,841) (6,297)
Net cash provided by operating activities 15,889 6,085
Cash flows from investing activities    
Purchases of investments (7,482) (17,782)
Maturities of short term investments 7,530 19,000
Purchases of property and equipment (8,658) (10,237)
Acquisitions of businesses (5,125) (11,505)
Proceeds from sale of property and equipment 196 283
Other (420) (1,050)
Net cash used in investing activities (13,959) (21,291)
Cash flows from financing activities    
Payments on term loan (Note 6) (1,000) (750)
Proceeds from vehicle and equipment notes payable 4,908 4,510
Debt issuance costs   (1)
Principal payments on long-term debt (3,946) (3,092)
Principal payments on finance lease obligations (1,366) (1,629)
Acquisition-related obligations (2,818) (1,740)
Repurchase of common stock   (24,640)
Surrender of common stock awards by employees (4) (56)
Net cash used in financing activities (4,226) (27,398)
Net change in cash and cash equivalents (2,296) (42,604)
Cash and cash equivalents at beginning of period 90,442 62,510
Cash and cash equivalents at end of period 88,146 19,906
Supplemental disclosures of cash flow information Net cash paid during the year for:    
Interest 5,816 3,914
Income taxes, net of refunds 737 899
Supplemental disclosure of noncash activities    
Right-of-use assets obtained in exchange for operating lease obligations 3,851  
Property and equipment obtained in exchange for finance lease obligations 1,108 312
Seller obligations in connection with acquisition of businesses 1,380 3,093
Unpaid purchases of property and equipment included in accounts payable $ 1,503 $ 1,485