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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities    
Net income $ 18,337 $ 15,806
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization of property and equipment 13,482 11,281
Amortization of intangibles 12,966 5,289
Amortization of deferred financing costs and debt discount 424 179
Provision for doubtful accounts 1,807 1,181
Write-off of debt issuance costs 1,201 286
Gain on sale of property and equipment (190) (173)
Noncash stock compensation 2,570 1,171
Deferred income taxes   708
Changes in assets and liabilities, excluding effects of acquisitions    
Accounts receivable (17,421) (9,742)
Inventories 342 (3,310)
Other assets (1,263) 2,442
Accounts payable (2,043) 6,632
Income taxes payable/receivable (4,102) (873)
Other liabilities 2,316 5,283
Net cash provided by operating activities 28,426 36,160
Cash flows from investing activities    
Purchases of investments (25,328)  
Purchases of property and equipment (14,681) (13,424)
Acquisitions of businesses, net of cash acquired of $247 and $0, respectively (116,883) (29,948)
Proceeds from sale of property and equipment 451 384
Other (1,532)  
Net cash used in investing activities (157,973) (42,988)
Cash flows from financing activities    
Proceeds from revolving line of credit under credit agreement applicable to respective period (Note 5)   37,975
Payments on revolving line of credit under credit agreement applicable to respective period (Note 5)   (37,975)
Proceeds from term loan under credit agreement applicable to respective period (Note 5) 300,000 100,000
Payments on term loan under credit agreement applicable to respective period (Note 5) (96,250) (49,375)
Proceeds from delayed draw term loan under credit agreement applicable to respective period (Note 5) 112,500 12,500
Payments on delayed draw term loan under credit agreement applicable to respective period (Note 5) (125,000) (50,000)
Proceeds from vehicle and equipment notes payable 9,317 11,039
Debt issuance costs (7,940) (1,238)
Principal payments on long term debt (4,915) (2,591)
Principal payments on capital lease obligations (3,738) (4,556)
Acquisition-related obligations (1,669) (1,191)
Surrender of common stock awards by employees (550) (836)
Net cash provided by financing activities 181,755 13,752
Net change in cash 52,208 6,924
Cash at beginning of period 14,482 6,818
Cash at end of period 66,690 13,742
Supplemental disclosures of cash flow information Net cash paid during the period for:    
Interest 5,634 2,537
Income taxes, net of refunds 13,401 8,355
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 2,519 2,033
Seller obligations in connection with acquisition of businesses 3,025 $ 2,430
Unpaid purchases of property and equipment included in accounts payable $ 658