Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (351,043)	$ (4,244)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	58,518	72,547
Goodwill impairments	244,967
Impairments of definite-lived intangible assets	52,152
Insurance proceeds received on settlement of claim	(14,100)
Payment on settlement of claim	14,100
Share-based compensation expense	12,632	15,771
Net provision for doubtful accounts	9,090	5,862
Write-off of debt issuance costs	731
Amortization of debt issuance costs	3,101	3,703
Write-down on assets held for sale to net realizable value	1,654
Changes in fair value of contingent consideration	49	2,419
Contingent consideration payments	(1,298)	(3,181)
Deferred income tax benefit	(1,322)	(2,034)
Impairment of non-consolidated entities		329
Other	(7)	(43)
Changes in operating assets and liabilities, net of business acquisition
Accounts receivable	(13,871)	(31,090)
Inventories	29,668	36,717
Accounts payable	57,759	(73,227)
Rebates payable	195	1,209
Other assets and liabilities	5,070	8,469
Net cash provided by operating activities	108,045	33,207
Cash flows from investing activities:
Expenditures for property and equipment	(3,961)	(7,880)
Expenditures for capitalized software for internal use	(14,050)	(8,736)
Payments to acquire businesses, net of cash acquired	(7,048)	(1,139)
Other	22	46
Net cash used in investing activities	(25,037)	(17,709)
Cash flows from financing activities:
Net payments on revolving line of credit	(71,300)	(10,000)
Payments on long term debt	(8,625)	(82,625)
Payments of debt issuance costs	(2,471)	(821)
Proceeds from issuance of stock upon stock option exercises	600	3,999
Contingent consideration payments	(2,277)	(2,088)
Net cash used in financing activities	(84,073)	(91,535)
Net decrease in cash and equivalents	(1,065)	(76,037)
Cash and equivalents at beginning of period	9,485	84,251
Cash and equivalents at end of period	8,420	8,214
Supplemental disclosures of cash flow information:
Cash paid for interest	28,212	27,707
Cash paid for income taxes	2,354	$ 2,142
Noncash investing and financing activities:
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 2,101