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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 339,132 $ 104,809 $ 122,297
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 82,556 65,926 22,103
Amortization of inventory step-up adjustment to fair value   15,090  
Amortization of debt issuance cost and original issue discount 10,699 9,265  
Stock-based compensation 24,378 25,228 13,013
Provision for excess and obsolete inventory 20,213 16,039 13,602
Provision for doubtful accounts 825 1,109 (255)
Deferred income taxes (4,831) (38,822) 410
Excess tax benefits from stock-based compensation   (1,468) (904)
Asset impairment 6,719 5,000  
Gain on sale of business (74,856)    
Other 824 256 275
Changes in operating assets and liabilities:      
Trade accounts receivable (44,077) (58,111) 2,334
Inventories (72,471) (13,798) (14,501)
Income taxes 12,805 30,914 (8,462)
Other current and non-current assets (8,631) (12,165) (1,526)
Accrued compensation 32,502 10,965 3,335
Other current and non-current liabilities 18,030 3,681 (2,797)
Accounts payable 11,405 16,180 (10,629)
Net cash provided by operating activities 355,222 180,098 138,295
Cash flows from investing activities:      
Acquisition of business, net of cash acquired   (939,591) (9,910)
Net proceeds from sale of business 72,509    
Purchases of investments (229,557) (268,458) (385,999)
Maturities of investments 157,342 160,917 179,285
Sales of investments 53,564 338,996 61,659
Purchases of property, plant and equipment (31,287) (19,123) (12,414)
Other 66 273 8
Net cash provided by (used in) investing activities 22,637 (726,986) (167,371)
Cash flows from financing activities:      
Restricted cash 4,835 (5,860)  
Proceeds from short-term borrowings 28,360 18,964  
Payments of short-term borrowings (29,711) (11,742)  
Proceeds from long-term borrowings 191 744,653  
Payments of long-term borrowings (228,141) (153,395)  
Repurchases of common stock   (1,545) (13,294)
Net proceeds related to employee stock awards (12,216) (1,922) 1,262
Dividend payments (38,178) (36,361) (35,969)
Excess tax benefit from stock-based compensation   1,468 904
Net cash (used in) provided by financing activities (274,860) 554,260 (47,097)
Effect of exchange rate changes on cash and cash equivalents 2,146 (6,323) (1,690)
Increase (decrease) in cash and cash equivalents 105,145 1,049 (77,863)
Cash and cash equivalents at beginning of year 228,623 227,574 305,437
Cash and cash equivalents at end of year 333,768 228,623 227,574
Cash paid during the period for:      
Interest 20,467 20,839 34
Income taxes $ 104,691 $ 44,967 $ 43,239