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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.

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