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	$ 21,340	$ 11,226
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	26,450	23,288
Amortization of intangible assets	7,921	10,533
Amortization of debt issuance costs	842	1,846
Deferred income taxes	4,155	(1,975)
Non-cash stock compensation expense	3,385	3,693
Loss (gain) on sale of property, equipment and real estate	280	(372)
Impairment of assets	26	11,883
Amortization of inventory step-up charges	0	2,884
Gain on insurance proceeds	0	(1,003)
Other non-cash adjustments	419	92
Change in assets and liabilities, net of effects of acquisitions
Accounts receivable, net of allowances	(51,197)	(40,188)
Inventories, net	(39,017)	(26,295)
Accounts payable	37,088	40,579
Other assets and liabilities	(468)	3,197
Net cash provided by operating activities	11,224	39,388
Cash flows from investing activities
Purchases of property, equipment and real estate	(34,782)	(19,522)
Purchases of businesses, net of cash acquired	(38,737)	0
Proceeds from sale of property, equipment and real estate	1,038	964
Insurance proceeds	0	1,151
Net cash used in investing activities	(72,481)	(17,407)
Cash flows from financing activities
Proceeds from revolving line of credit	485,388	790,535
Repayments of proceeds from revolving line of credit	(418,666)	(813,791)
Principal payments on other notes	(2,580)	(2,501)
Payments on capital leases obligations	(5,259)	(4,268)
Proceeds from issuance of common stock, net of offering costs	0	13,614
Other financing activities, net	798	(655)
Net cash provided by (used in) financing activities	59,681	(17,066)
Net (decrease) increase in cash and cash equivalents	(1,576)	4,915
Cash and cash equivalents
Beginning of period	8,917	1,089
End of period	7,341	6,004
Supplemental disclosure of non-cash investing and financing transactions
Assets acquired under capital lease obligations	$ 2,481	$ 3,248