Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019		Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 30,998		$ 4,875
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,074		18,304
Provision for doubtful accounts	2,096		448
Provision for warranty and returns	2,692		367
Stock compensation	6,209		5,462
Loss on disposal of property and equipment	12,682		53
Bond premium amortization	28		142
Debt Issuance Costs amortization	72		72
Change in fair value of contingent earn-out	(7,700)		(4,000)
Asset Impairment Charges	0		269
Impairment of Intangible Assets, Finite-lived	0		5,000
Other Noncash Expense	4,371		4,783
Cash provided by (used in) changes in operating assets and liabilities
Accounts receivable	(49,534)		(11,901)
Inventories	(11,968)		10,942
Prepaid expenses and other assets	10,319		3,569
Related-party receivables	0		(32,779)
Increase (Decrease) in Other Operating Assets	(7,542)		(2,348)
Accounts payable	3,075		8,737
Accrued liabilities	(34,814)		(29,455)
Income taxes, including excess tax benefits and deferred income taxes	(1,068)		(3,272)
Net cash provided by operating activities	(21,010)		(20,732)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(28,671)		(26,544)
Proceeds from Sale of Other Productive Assets	0		13,000
Proceeds from sale of asset	16		0
Intangible assets additions	(1,949)		(1,899)
Purchases of investment securities	(4,409)		(4,478)
Proceeds from sale of investment securities	24,500		4,900
Net cash used in investing activities	(10,513)		(15,021)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	925		3,155
Payments Related to Tax Withholding for Share-based Compensation	18,157		5,338
Net cash (used in) provided by financing activities	(17,232)		(2,183)
Effect of exchange rate changes on cash	18		2,400
NET INCREASE DECREASE IN CASH AND CASH EQUIVALENTS	(48,737)		(35,536)
CASH AND CASH EQUIVALENTS, beginning of period	344,781	[1]	290,072
CASH AND CASH EQUIVALENTS, end of period	296,044		254,536
NON-CASH INVESTING ACTIVITIES
Capital Expenditures Incurred but Not yet Paid	$ 13,131		$ 280

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