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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows provided by operating activities:    
Net income $ 321,260 $ 261,494
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 59,906 62,550
Amortization of debt issuance costs, original issue discount and soft call premium 3,784 6,385
Asset impairment   6,719
Gain on sale of business   (74,856)
Stock-based compensation 22,005 19,834
Provision for excess and obsolete inventory 15,575 15,349
Provision for bad debt 859 650
Deferred income taxes (3,525) 6,641
Other 531 832
Changes in operating assets and liabilities:    
Trade accounts receivable (23,125) (26,489)
Inventories (80,441) (51,251)
Income taxes (13,874) 15,646
Other current and non-current assets (17,652) (9,714)
Accrued compensation (15,529) 11,058
Other current and non-current liabilities 8,934 22,517
Accounts payable (385) 7,071
Net cash provided by operating activities 278,323 274,436
Cash flows (used in) provided by investing activities:    
Net proceeds from sale of business   72,509
Purchases of investments (213,774) (199,012)
Maturities of investments 135,339 116,779
Sales of investments 67,868 43,571
Purchases of property, plant and equipment (36,885) (17,857)
Net cash (used in) provided by investing activities (47,452) 15,990
Cash flows used in financing activities:    
Repurchase of common stock (75,000)  
Proceeds from short and long-term borrowings 60,624 13,158
Payments on short-term borrowings (57,865) (13,277)
Payments on long-term borrowings (50,002) (178,141)
Net payments related to employee stock awards (13,641) (14,719)
Dividend payments to common stockholders (31,608) (28,403)
Net cash used in financing activities (167,492) (221,382)
Effect of exchange rate changes on cash and cash equivalents 2,584 3,140
Increase in cash and cash equivalents and restricted cash 65,963 72,184
Cash and cash equivalents, including restricted cash, at beginning of period [1] 333,887 233,910
Cash and cash equivalents, including restricted cash, at end of period [2] $ 399,850 $ 306,094
[1] Restricted cash at the beginning of the period was $119 and $5,287 for the nine months ended September 30, 2018 and 2017, respectively.
[2] Restricted cash at the end of the period was $114 and $117 for the nine months ended September 30, 2018 and 2017, respectively.