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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities    
Net income $ 22,709 $ 18,337
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization of property and equipment 16,231 13,482
Amortization of intangibles 14,450 12,966
Amortization of deferred financing costs and debt discount 601 424
Provision for doubtful accounts 1,108 1,807
Write-off of debt issuance costs 1,114 1,201
Gain on sale of property and equipment (227) (190)
Noncash stock compensation 4,196 2,570
Changes in assets and liabilities, excluding effects of acquisitions    
Accounts receivable (20,192) (17,421)
Inventories (3,995) 342
Other assets (3,739) (1,263)
Accounts payable 304 (2,043)
Income taxes payable/receivable 5,187 (4,102)
Other liabilities (4,622) 2,316
Net cash provided by operating activities 33,125 28,426
Cash flows from investing activities    
Purchases of investments (17,782) (25,328)
Maturities of short term investments 27,500  
Purchases of property and equipment (18,478) (14,681)
Acquisitions of businesses, net of cash acquired of $0 and $247, respectively (18,626) (116,883)
Proceeds from sale of property and equipment 557 451
Other (1,540) (1,532)
Net cash used in investing activities (28,369) (157,973)
Cash flows from financing activities    
Proceeds from term loan under credit agreement applicable to respective period (Note 6) 100,000 300,000
Payments on term loan under credit agreement applicable to respective period (Note 6) (750) (96,250)
Proceeds from delayed draw term loan under credit agreement applicable to respective period (Note 6)   112,500
Payments on delayed draw term loan under credit agreement applicable to respective period (Note 6)   (125,000)
Proceeds from vehicle and equipment notes payable 14,271 9,317
Debt issuance costs (1,933) (7,940)
Principal payments on long-term debt (6,863) (4,915)
Principal payments on capital lease obligations (3,028) (3,738)
Acquisition-related obligations (2,295) (1,669)
Repurchase of common stock (24,640)  
Surrender of common stock awards by employees (2,282) (550)
Net cash provided by financing activities 72,480 181,755
Net change in cash and cash equivalents 77,236 52,208
Cash and cash equivalents at beginning of period 62,510 14,482
Cash and cash equivalents at end of period 139,746 66,690
Supplemental disclosures of cash flow information Net cash paid during the period for:    
Interest 8,349 5,634
Income taxes, net of refunds 1,906 13,401
Supplemental disclosure of noncash investing and financing activities    
Common stock issued for acquisition of business   10,859
Vehicles capitalized under capital leases and related lease obligations 814 2,519
Seller obligations in connection with acquisition of businesses 3,801 3,025
Unpaid purchases of property and equipment included in accounts payable $ 1,027 $ 658