Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 61,323	$ 34,599
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,535	24,701
Unrealized foreign currency (gain) loss, net	(2,028)	1,017
Share-based compensation	9,320	6,851
Other non-cash items	8,104	(1,208)
Changes in operating assets and liabilities:
Accounts receivable, net of allowances	(37,394)	(9,068)
Inventories	4,468	12,435
Prepaid expenses and other assets	5,271	12,997
Accounts payable, accrued expenses and other liabilities	15,271	(1,909)
Cash provided by operating activities	85,870	80,415
Cash flows from investing activities:
Purchases of property, equipment, and software	(5,224)	(14,263)
Proceeds from disposal of property and equipment	1,325	1,562
Cash used in investing activities	(3,899)	(12,701)
Cash flows from financing activities:
Proceeds from bank borrowings	0	5,500
Repayments of bank borrowings and capital lease obligations	(680)	(8,222)
Dividends—Series A convertible preferred stock	(9,000)	(9,000)
Repurchases of common stock	(37,046)	(25,645)
Other	31	(233)
Cash used in financing activities	(46,695)	(37,600)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(5,133)	499
Net change in cash, cash equivalents, and restricted cash	30,143	30,613
Cash, cash equivalents, and restricted cash—beginning of period	177,055	152,646
Cash, cash equivalents, and restricted cash—end of period	$ 207,198	$ 183,259