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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 12,455 $ 105,121
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 25,211 20,492
Amortization of inventory step-up adjustment to fair value 5,140  
Amortization of debt issuance costs, original issue discount, and soft call premium 1,202 2,019
Stock-based compensation 27,838 10,426
Provision for excess and obsolete inventory 5,063 5,333
(Recovery) provision for doubtful accounts (440) 335
Deferred income taxes (2,445) (705)
Other 66 34
Changes in operating assets and liabilities, net of business acquired:    
Trade accounts receivable 4,028 (37,336)
Inventories (10,327) (28,177)
Income taxes (3,653) 8,822
Other current and non-current assets 4,804 (942)
Accrued compensation (22,957) (32,531)
Other current and non-current liabilities 359 10,544
Accounts payable (17,294) 9,321
Net cash provided by operating activities 29,050 72,756
Cash flows used in investing activities:    
Acquisition of business, net of cash acquired (988,599)  
Purchases of investments (44,212) (49,753)
Maturities of investments 18,684 49,596
Sales of investments 154,489 8,930
Proceeds from sale of assets 35  
Purchases of property, plant and equipment (14,529) (9,390)
Net cash used in investing activities (874,132) (617)
Cash flows provided by (used in) financing activities:    
Net proceeds from short and long-term borrowings 638,638 11,907
Payments on short-term borrowings (176) (10,274)
Payments on long-term borrowings   (50,000)
Net payments related to employee stock awards (8,987) (8,921)
Dividend payments to common stockholders (10,843) (9,808)
Net cash provided by (used in) financing activities 618,632 (67,096)
Effect of exchange rate changes on cash and cash equivalents 121 1,958
(Decrease) Increase in cash and cash equivalents and restricted cash (226,329) 7,001
Cash and cash equivalents at beginning of period 644,345 333,887
Cash and cash equivalents at end of period $ 418,016 $ 340,888