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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 50,194 $ 227,983
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 52,655 40,377
Amortization of inventory step-up adjustment to fair value 7,624  
Amortization of debt issuance costs, original issue discount, and soft call premium 2,953 2,887
Stock-based compensation 34,767 16,792
Provision for excess and obsolete inventory 12,053 10,292
(Recovery) provision for doubtful accounts (691) 596
Deferred income taxes (2,625) 1,170
Other 917 460
Changes in operating assets and liabilities, net of business acquired:    
Trade accounts receivable 27,163 (42,511)
Inventories (30,821) (59,529)
Income taxes (3,941) (11,416)
Other current and non-current assets (897) (4,317)
Accrued compensation (17,808) (15,933)
Other current and non-current liabilities (273) 9,912
Accounts payable (24,666) 5,604
Net cash provided by operating activities 106,604 182,367
Cash flows used in investing activities:    
Acquisition of business, net of cash acquired (988,599)  
Purchases of investments (117,919) (148,816)
Maturities of investments 40,386 90,734
Sales of investments 157,710 63,363
Proceeds from sale of assets 35  
Purchases of property, plant and equipment (28,254) (21,818)
Net cash used in investing activities (936,641) (16,537)
Cash flows provided by (used in) financing activities:    
Net proceeds from short and long-term borrowings 640,939 36,989
Payments on short-term borrowings (1,926) (28,059)
Payments on long-term borrowings (51,625) (50,000)
Net payments related to employee stock awards (11,012) (13,052)
Dividend payments to common stockholders (21,723) (20,750)
Net cash provided by (used in) financing activities 554,653 (74,872)
Effect of exchange rate changes on cash and cash equivalents (2,026) 2,586
(Decrease) Increase in cash and cash equivalents and restricted cash (277,410) 93,544
Cash and cash equivalents at beginning of period 644,345 333,887
Cash and cash equivalents at end of period $ 366,935 $ 427,431