Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019		Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 80,394		$ 36,148
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,025		55,069
Operatingleaserightofuseassetamortization	6,149		0
Provision for doubtful accounts	7,839		638
Provision for warranty and returns	1,277		1,817
Stock compensation	16,161		17,992
Loss on disposal of property and equipment	13,350		760
Bond premium amortization	103		313
Debt Issuance Costs amortization	216		216
Change in fair value of contingent earn-out	(47,400)		20,500
Asset Impairment Charges	0		269
Impairment of Intangible Assets, Finite-lived	0		5,000
Sparepartsusage	20,044		6,999
Other Noncash Income (Expense)	1,757		2,100
Cash provided by (used in) changes in operating assets and liabilities
Accounts receivable	(32,484)		(38,957)
Inventories	(30,924)		12,201
Prepaid expenses and other assets	8,815		(506)
Related-party receivables	0		31,004
Increase (Decrease) in Other Operating Assets	(29,494)		(8,319)
Accounts payable	(3,038)		(2,094)
Accrued liabilities	(23,214)		(18,509)
Income taxes, including excess tax benefits and deferred income taxes	6,478		(12,359)
Net cash provided by operating activities	53,054		110,282
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(73,253)		(75,057)
Proceeds from Sale of Other Productive Assets	0		13,000
Proceeds from sale of asset	19		0
Payments to Acquire Businesses, Net of Cash Acquired	4,600		1,300
Intangible assets additions	(6,461)		(5,375)
Purchases of investment securities	(17,994)		(30,495)
Proceeds from sale of investment securities	36,400		14,940
Net cash used in investing activities	(65,889)		(84,287)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	4,240		14,211
Payment, Tax Withholding, Share-based Payment Arrangement	18,478		6,119
Net cash (used in) provided by financing activities	(14,238)		8,092
Effect of exchange rate changes on cash	(1,759)		(5,343)
NET INCREASE DECREASE IN CASH AND CASH EQUIVALENTS	(28,832)		28,744
CASH AND CASH EQUIVALENTS, beginning of period	344,781	[1]	290,072
CASH AND CASH EQUIVALENTS, end of period	315,949
NON-CASH INVESTING ACTIVITIES
Capital Expenditures Incurred but Not yet Paid	$ 11,365		$ 1,184

[1] December 31, 2018 balances were derived from audited consolidated financial statements.