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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows provided by operating activities:    
Net income $ 227,983 $ 185,500
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 40,377 42,421
Amortization of debt issuance costs, original issue discount and soft call premium 2,887 3,742
Asset impairment   6,719
Gain on sale of business   (74,856)
Stock-based compensation 16,792 14,989
Provision for excess and obsolete inventory 10,292 11,002
Provision for bad debt 596 511
Deferred income taxes 1,170 7,798
Other 460 796
Changes in operating assets and liabilities:    
Trade accounts receivable (42,511) (15,901)
Inventories (59,529) (34,056)
Income taxes (11,416) 21,918
Other current and non-current assets (4,317) (2,779)
Accrued compensation (15,933) (161)
Other current and non-current liabilities 9,912 4,970
Accounts payable 5,604 2,860
Net cash provided by operating activities 182,367 175,473
Cash flows (used in) provided by investing activities:    
Net proceeds from sale of business   72,509
Purchases of investments (148,816) (69,582)
Maturities of investments 90,734 85,234
Sales of investments 63,363 25,319
Purchases of property, plant and equipment (21,818) (9,739)
Net cash (used in) provided by investing activities (16,537) 103,741
Cash flows used in financing activities:    
Proceeds from short and long-term borrowings 36,989 8,637
Payments on short-term borrowings (28,059) (9,261)
Payments on long-term borrowings (50,000) (53,141)
Net payments related to employee stock awards (13,052) (13,413)
Dividend payments to common stockholders (20,750) (18,903)
Net cash used in financing activities (74,872) (86,081)
Effect of exchange rate changes on cash and cash equivalents 2,586 1,069
Increase in cash and cash equivalents and restricted cash 93,544 194,202
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] $ 427,431 $ 428,112
[1] Restricted cash at the beginning of the period was $119 and $5,287 for the six months ended June 30, 2018 and 2017, respectively.
[2] Restricted cash at the end of the period was $114 and $5,282 for the six months ended June 30, 2018 and 2017, respectively.