Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Cash flows from operating activities:
Net loss		$ (32,417)	$ (63,146)	[1]	$ (84,455)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization		49,059	64,862		52,143
Write-off of deferred loan costs		279	0		1,244
Amortization of deferred loan costs and debt discount		7,695	7,022		3,085
Provision for doubtful accounts		(2,573)	11,662		7,097
Foreign currency loss (gain)		494	1,712		499
Deferred income taxes		3,795	(31,734)		(66,246)
Gain on revaluation of contingent consideration		0	(202)		(1,174)
(Gain) loss on asset disposal		(187)	(552)		553
Loss (gain) on convertible debt embedded derivative (see Note 9)		0	24,783		(818)
Goodwill impairment loss		0	0		75,241
Non-cash compensation cost		10,055	12,256		7,876
Other, net		(2,409)	(3,762)		(3,789)
(Increase) decrease (net of the effects of acquisitions):
Receivables		27,194	15,386		(39,820)
Inventory		9,551	(21)		614
Prepaid expenses and other current assets		494	6,933		6,642
Increase (decrease) (net of the effects of acquisitions):
Accounts payable		(5,356)	(8,994)		6,424
Other accrued liabilities		(8,378)	9,168		14,896
Income taxes		1,540	(3,514)		6,260
Net cash provided by (used) in operating activities		58,836	41,859		(13,728)
Cash flows from investing activities:
Capital expenditures	[2]	(29,035)	(27,164)		(36,798)
Proceeds from disposal of assets		934	2,580		3,259
Other		0	(443)		(457)
Net cash used in investing activities		(28,101)	(25,027)		(33,996)
Cash flows from financing activities:
Net (payments) borrowings under revolving credit agreement		(82,396)	(19,690)		(23,006)
Borrowings (payments) under term loan, net of debt discount		49,745	0		(170,000)
Issuance of convertible debt, net of issuance costs		0	0		222,311
Contingent consideration payments		(428)	(1,106)		(1,278)
Debt issuance costs on Credit Facility		(1,524)	(855)		(1,938)
Exercise of stock options		0	0		450
Payments related to withholding tax for share-based payment arrangements		(1,911)	(1,390)		(947)
Other		(291)	0		0
Net cash (used in) provided by financing activities		(36,805)	(23,041)		25,592
Effect of exchange rate changes on cash		(43)	(2,055)		2,468
Net decrease in cash and cash equivalents		(6,113)	(8,264)		(19,664)
Cash and cash equivalents at beginning of period		18,288	26,552		46,216
Cash and cash equivalents at end of period		12,175	18,288		26,552
Cash paid (refunded) during the year for:
Interest		22,697	24,924		13,176
Income taxes		$ (3,536)	$ 2,720		$ 5,719

[1] Income (loss) from continuing operations, net income (loss) and the related earnings (loss) per share amounts for each of the quarters in 2018 are revised from those originally reported to correct errors in income tax expense (benefit) associated with the measurement of valuation allowances on deferred tax assets. Based on an analysis of quantitative and qualitative factors, the Company determined the related impacts were not material to its previously filed interim consolidated financial statements, and therefore, amendments of previously filed reports are not required.

[2] Excludes accrued capital expenditures for the twelve months ended December 31, 2019 and 2018 only.