Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018		Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 4,875		$ 55,863
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,304		11,594
Provision for doubtful accounts	448		13
Provision for warranty and returns	367		1,286
Stock compensation	5,462		4,006
Loss on disposal of property and equipment	53		18
Bond premium amortization	142		0
Debt Issuance Costs amortization	72		0
Bargain purchase gain	0		(63,237)
Change in fair value of contingent earn-out	(4,000)		0
Asset Impairment Charges	269		0
Impairment of Intangible Assets, Finite-lived	5,000		0
Other Noncash Expense	2,435		0
Cash provided by (used in) changes in operating assets and liabilities
Accounts receivable	(11,901)		(82,266)
Inventories	10,942		22,233
Prepaid expenses and other assets	3,569		(66,573)
Related-party receivables	(32,779)		0
Accounts payable	8,737		11,456
Accrued liabilities	(29,455)		39,907
Income taxes, including excess tax benefits and deferred income taxes	(3,272)		(10,909)
Net cash provided by operating activities	(20,732)		(76,609)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(26,544)		(16,396)
Proceeds from sale of asset	13,000		0
Business acquisitions, net of cash acquired	0		157,097
Intangible assets additions	(1,899)		(410)
Purchases of investment securities	(4,478)		0
Proceeds from sale of investment securities	4,900		0
Net cash used in investing activities	(15,021)		(173,903)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	3,155		8,992
Proceeds from employee stock purchase plan	0		1,326
Purchase of treasury stock	(5,338)		(3,718)
Net cash (used in) provided by financing activities	(2,183)		6,600
Effect of exchange rate changes on cash	2,400		692
NET DECREASE IN CASH AND CASH EQUIVALENTS	(35,536)		(243,220)
CASH AND CASH EQUIVALENTS, beginning of period	290,072	[1]	445,082
CASH AND CASH EQUIVALENTS, end of period	254,536		201,862
NON-CASH INVESTING ACTIVITIES
Capital Expenditures Incurred but Not yet Paid	280		437
Fair Value of Assets Acquired	0		881,732
Payments to Acquire Businesses, Net of Cash Acquired	0		(157,097)
Proceeds from Issuance of Debt	0		(75,000)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	0		7,512
Business Combination, Contingent Consideration, Liability, Noncurrent	0		(19,000)
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	0		(413,139)
BARGAIN PURCHASE GAIN	0		(63,237)
Goodwill, Period Increase (Decrease)	0		1,015
Increase (Decrease) in Assumed Liabilities	0		162,786
Tangent [Member]
NON-CASH INVESTING ACTIVITIES
BARGAIN PURCHASE GAIN	$ 0		$ (63,237)

[1] December 31, 2017 balances were derived from audited consolidated financial statements.