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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 104,809 $ 122,297 $ 115,778
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 65,926 22,103 20,514
Amortization of inventory step-up adjustment to fair value 15,090   2,179
Amortization of debt issuance cost and original issue discount 9,265    
Stock-based compensation 25,228 13,013 11,315
Provision for excess and obsolete inventory 16,039 13,602 12,131
Provision for doubtful accounts 1,109 (255) 668
Deferred income taxes (38,822) 410 5,264
Excess tax benefits from stock-based compensation (1,468) (904) (447)
Impairment of investment 5,000    
Other 256 275 139
Changes in operating assets and liabilities:      
Trade accounts receivable (58,111) 2,334 6,103
Inventories (13,798) (14,501) (23,089)
Income taxes 30,914 (8,462) (32,744)
Other current and non-current assets (12,165) (1,526) (325)
Accrued compensation 10,965 3,335 (13,563)
Other current and non-current liabilities 3,681 (2,797) 3,469
Accounts payable 16,180 (10,629) (5,478)
Net cash provided by operating activities 180,098 138,295 101,914
Cash flows from investing activities:      
Acquisition of business, net of cash acquired (939,591) (9,910) (86,950)
Purchases of investments (268,458) (385,999) (360,813)
Maturities of investments 160,917 179,285 249,359
Sales of investments 338,996 61,659 185,186
Purchases of property, plant and equipment (19,123) (12,414) (13,183)
Other 273 8 1,593
Net cash used in investing activities (726,986) (167,371) (24,808)
Cash flows from financing activities:      
Restricted cash (5,860)    
Proceeds from short-term borrowings 18,964    
Payments on short-term borrowings (11,742)    
Net proceeds from long-term borrowings 744,653    
Payments of long-term borrowings (153,395)    
Repurchases of common stock (1,545) (13,294) (20,809)
Net proceeds related to employee stock awards (1,922) 1,262 2,492
Dividend payments (36,361) (35,969) (34,851)
Excess tax benefit from stock-based compensation 1,468 904 447
Net cash provided by (used in) financing activities 554,260 (47,097) (52,721)
Effect of exchange rate changes on cash and cash equivalents (6,323) (1,690) (7,850)
Increase (decrease) in cash and cash equivalents 1,049 (77,863) 16,535
Cash and cash equivalents at beginning of year 227,574 305,437 288,902
Cash and cash equivalents at end of year 228,623 227,574 305,437
Cash paid during the period for:      
Interest 20,839 34 44
Income taxes $ 44,967 $ 43,239 $ 47,948