Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 46,510	$ 37,535
CASH FLOWS FROM OPERATING ACTIVITIES:
Income from discontinued operations, net of income taxes	140	2,094
Income from continuing operations, net of income taxes	46,370	35,441
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,861	1,987
Stock-based compensation expense	4,494	3,398
Loss on foreign exchange hedge	0	3,489
Net loss on disposal of assets	(138)	(65)
Changes in operating assets and liabilities, net of assets acquired:
Accounts and other receivables	(17,457)	(431)
Inventories	(17,113)	(8,047)
Other current assets	364	(1,109)
Accounts payable	11,932	5,194
Other liabilities and accrued expenses	(2,346)	(614)
Income taxes	5,642	3,286
Net cash provided by operating activities from continuing operations	34,885	42,659
Net cash used in operating activities from discontinued operations	(1,784)	(2,453)
Net cash provided by operating activities	33,101	40,206
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition, net of cash acquired	(6,072)	0
Purchase of foreign exchange hedge	0	(3,489)
Purchases of property and equipment	(3,923)	(1,391)
Net cash used in investing activities from continuing operations	(9,995)	(4,880)
Net cash used in investing activities from discontinued operations	0	0
Net cash used in investing activities	(9,995)	(4,880)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase and retirement of common stock	12,750	0
Net payments related to stock-based award activities	(4,032)	(1,688)
Net cash used in financing activities from continuing operations	(16,782)	(1,688)
Net cash used in financing activities from discontinued operations	0	0
Net cash used in financing activities	(16,782)	(1,688)
EFFECT OF CURRENCY TRANSLATION ON CASH	167	1,133
INCREASE IN CASH AND CASH EQUIVALENTS	6,491	34,771
CASH AND CASH EQUIVALENTS, beginning of period	415,037	289,517
CASH AND CASH EQUIVALENTS, end of period	421,528	324,288
Less cash and cash equivalents from discontinued operations	7,654	6,339
CASH AND CASH EQUIVALENTS FROM CONTINUING OPERATIONS, end of period	413,874	317,949
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	56	0
Cash paid for income taxes	3,404	918
Cash received for refunds of income taxes	95	396
Cash held in banks outside the United States	$ 320,753	$ 239,553