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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows provided by operating activities:    
Net income $ 105,121 $ 65,060
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 20,492 21,833
Amortization of debt issuance costs, original issue discount and soft call premium 2,019 2,715
Stock-based compensation 10,426 8,782
Provision for excess and obsolete inventory 5,333 5,031
Provision for bad debt 335 316
Deferred income taxes (705) (1,809)
Other 34 85
Changes in operating assets and liabilities:    
Trade accounts receivable (37,336) (15,215)
Inventories (28,177) (11,714)
Income taxes 8,822 8,067
Other current and non-current assets (942) (2,199)
Accrued compensation (32,531) (16,786)
Other current and non-current liabilities 10,544 1,082
Accounts payable 9,321 809
Net cash provided by operating activities 72,756 66,057
Cash flows provided by investing activities:    
Purchases of investments (49,753) (42,292)
Maturities of investments 49,596 55,672
Sales of investments 8,930 21,179
Purchases of property, plant and equipment (9,390) (4,099)
Net cash (used in) provided by investing activities (617) 30,460
Cash flows used in financing activities:    
Proceeds from short and long-term borrowings 11,907 736
Payments on short-term borrowings (10,274) (1,398)
Payments on long-term borrowings (50,000) (51,570)
Net payments related to employee stock awards (8,921) (2,894)
Dividend payments to common stockholders (9,808) (9,419)
Net cash used in financing activities (67,096) (64,545)
Effect of exchange rate changes on cash and cash equivalents 1,958 (4,696)
Increase in cash and cash equivalents and restricted cash 7,001 27,276
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] $ 340,888 $ 261,186
[1] Restricted cash at the beginning of the period was $119 and $5,287 for the three months ended March 31, 2018 and 2017, respectively.
[2] Restricted cash at the end of the period was $118 and $5,274 for the three months ended March 31, 2018 and 2017, respectively.