Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 35,742		$ 53,831
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	42,575		37,838
Operatingleaserightofuseassetamortization	4,527		4,150
Provision for doubtful accounts	162		5,838
Provision for warranty and returns	(1,221)		1,249
Stock compensation	12,349		12,438
Loss on disposal of property and equipment	1,078		12,845
Bond premium amortization	85		68
Debt Issuance Costs amortization	144		144
Change in fair value of contingent earn-out	2,700		(47,200)
Inventory Recall Expense	2,626		0
Sparepartsusage	5,045		14,649
Other Noncash Income (Expense)	1,615		(346)
Cash provided by (used in) changes in operating assets and liabilities
Accounts receivable	5,293		(46,861)
Inventories	8,481		(16,060)
Prepaid expenses and other assets	(9,333)		6,111
Increase (Decrease) in Other Operating Assets	(7,223)		(18,079)
Accounts payable	(23,305)		2,032
Accrued liabilities	(15,257)		(21,124)
Income taxes, including excess tax benefits and deferred income taxes	2,657		735
Net cash provided by operating activities	68,740		2,258
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(38,517)		(48,726)
Proceeds from sale of asset	147		19
Payments to Acquire Businesses, Net of Cash Acquired	0		(4,600)
Intangible assets additions	(4,104)		(4,088)
Purchases of investment securities	(7,082)		(17,994)
Proceeds from sale of investment securities	16,400		33,400
Net cash used in investing activities	(33,156)		(41,989)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Lines of Credit	150,000		0
Proceeds from exercise of stock options	6,799		3,934
Finance Lease, Principal Payments	(116)		0
Payment, Tax Withholding, Share-based Payment Arrangement	12,561		18,265
Net cash (used in) provided by financing activities	144,122		(14,331)
Effect of exchange rate changes on cash	(2,242)		1,148
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	177,464		(52,914)
CASH AND CASH EQUIVALENTS, beginning of period	268,670	[1]	344,781
CASH AND CASH EQUIVALENTS, end of period	446,134		291,867
NON-CASH INVESTING ACTIVITIES
Capital Expenditures Incurred but Not yet Paid	$ 9,775		$ 11,736

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