Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 60,728		$ 80,394
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	64,037		57,025
Operatingleaserightofuseassetamortization	6,859		6,149
Provision for doubtful accounts	2,785		7,839
Provision for warranty and returns	(1,296)		1,277
Stock compensation	18,614		16,161
Loss on disposal of property and equipment	1,673		13,350
Bond premium amortization	126		103
Debt Issuance Costs amortization	216		216
Change in fair value of contingent earn-out	7,000		(47,400)
Inventory Recall Expense	2,626		0
Sparepartsusage	8,391		20,044
Other Noncash Income (Expense)	2,523		1,757
Cash provided by (used in) changes in operating assets and liabilities
Accounts receivable	38,933		(32,484)
Inventories	8,859		(30,924)
Prepaid expenses and other assets	(6,535)		8,815
Increase (Decrease) in Other Operating Assets	(12,121)		(29,494)
Accounts payable	(38,032)		(3,038)
Accrued liabilities	(20,417)		(23,214)
Income taxes, including excess tax benefits and deferred income taxes	(743)		6,478
Net cash provided by operating activities	144,226		53,054
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(62,362)		(73,253)
Proceeds from sale of asset	154		19
Payments to Acquire Businesses, Net of Cash Acquired	0		(4,600)
Intangible assets additions	(6,325)		(6,461)
Purchases of investment securities	(9,603)		(17,994)
Proceeds from sale of investment securities	20,900		36,400
Net cash used in investing activities	(57,236)		(65,889)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Lines of Credit	150,000		0
Repayments of Short-term Debt	(150,000)		0
Proceeds from exercise of stock options	8,586		4,240
Finance Lease, Principal Payments	(231)		0
Payment, Tax Withholding, Share-based Payment Arrangement	12,821		18,478
Net cash (used in) provided by financing activities	(4,466)		(14,238)
Effect of exchange rate changes on cash	(201)		(1,759)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	82,323		(28,832)
CASH AND CASH EQUIVALENTS, beginning of period	268,670	[1]	344,781
CASH AND CASH EQUIVALENTS, end of period	350,993		315,949
NON-CASH INVESTING ACTIVITIES
Capital Expenditures Incurred but Not yet Paid	$ 3,633		$ 11,365

[1] December 31, 2019 balances were derived from audited consolidated financial statements.