Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net income	$ 27,355	$ 17,230
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization of property and equipment	17,240	11,872
Amortization of intangibles	8,178	4,091
Amortization of deferred financing costs and debt discount	282	199
Provision for doubtful accounts	1,960	1,551
Write-off of debt issuance costs	286
Gain on sale of property and equipment	(218)	(247)
Noncash stock compensation	1,531	1,532
Deferred income taxes	708	107
Changes in assets and liabilities, excluding effects of acquisitions
Accounts receivable	(17,878)	(16,405)
Inventories	(3,158)	(2,960)
Other assets	4,727	5,265
Accounts payable	3,879	5,777
Income taxes payable	3,652	1,918
Other liabilities	6,033	(819)
Net cash provided by operating activities	54,577	29,111
Cash flows from investing activities
Purchases of property and equipment	(19,169)	(19,959)
Acquisitions of businesses, net of cash acquired of $0 and $924, respectively	(36,427)	(71,040)
Proceeds from sale of property and equipment	523	448
Other		(420)
Net cash used in investing activities	(55,073)	(90,971)
Cash flows from financing activities
Proceeds from revolving line of credit under credit agreement applicable to respective period (Note 4)	37,975	130,800
Payments on revolving line of credit under credit agreement applicable to respective period (Note 4)	(37,975)	(130,800)
Proceeds from term loan under credit agreement applicable to respective period (Note 4)	100,000	50,000
Payments on term loan under credit agreement applicable to respective period (Note 4)	(50,625)	(24,688)
Proceeds from delayed draw term loan under credit agreement applicable to respective period (Note 4)	12,500	35,000
Payments on delayed draw term loan under credit agreement applicable to respective period (Note 4)	(50,000)
Proceeds from vehicle and equipment notes payable	16,310	12,817
Debt issuance costs	(1,238)	(758)
Principal payments on long term debt	(4,055)	(2,631)
Principal payments on capital lease obligations	(6,596)	(7,276)
Acquisition-related obligations	(2,732)
Repurchase of common stock		(6,100)
Surrender of common stock by employees	(836)
Net cash provided by financing activities	12,728	56,364
Net change in cash	12,232	(5,496)
Cash at beginning of period	6,818	10,761
Cash at end of period	19,050	5,265
Supplemental disclosures of cash flow information Net cash paid during the period for:
Interest	3,904	2,171
Income taxes, net of refunds	10,428	8,327
Supplemental disclosure of noncash investing and financing activities
Vehicles capitalized under capital leases and related lease obligations	2,956	2,750
Seller obligations in connection with acquisition of businesses	2,849	$ 12,364
Unpaid purchases of property and equipment included in accounts payable	$ 2,140