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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.

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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