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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income | $ 279,881 | $ 176,186 | $ 203,865
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Stock-based compensation expense | 43,774 | 42,661 | 45,589
Depreciation of property, plant, and equipment | 16,616 | 22,139 | 21,527
Gain (Loss) on Disposition of Property Plant Equipment | 33 | 1,817 | 324
Amortization of intangible assets | 3,667 | 4,364 | 3,373
Intangible asset impairment charges | 0 | 19,571 | 0
Excess and Obsolete Inventory Charges | 2,573 | 9,908 | 5,296
Operating Lease, Impairment Loss | 0 | 3,427 | 0
Amortization of discounts or premiums on investments | 4,887 | 1,274 | (618)
Realized gain on sale of investments | (236) | (4,119) | (1,452)
Revaluation of contingent consideration | 0 | (114) | (1,401)
Change in deferred income taxes | (3,118) | (3,353) | (94,866)
Accounts receivable | (4,503) | (21,285) | 16,807
Unbilled revenue | 1,637 | (848) | 3,530
Inventories | (54,920) | (10,319) | 17,841
Prepaid expenses and other current assets | (32,342) | (9,909) | 7,405
Accounts payable | 27,828 | (1,688) | 1,633
Accrued expenses | 16,861 | 24,542 | (8,938)
Accrued income taxes | (6,401) | (22,973) | 25,266
Deferred revenue and customer deposits | 14,417 | 6,571 | 3,875
Other | 3,411 | 4,548 | 4,255
Net cash provided by operating activities | 314,065 | 242,400 | 253,311
Cash flows from investing activities: |  |  |
Purchases of investments | (668,053) | (922,867) | (1,031,642)
Maturities and sales of investments | 430,969 | 1,104,605 | 1,062,962
Purchases of property, plant, and equipment | (15,455) | (13,303) | (21,745)
Business acquisitions | 0 | 1,004 | (166,911)
Net cash provided by (used in) investing activities | (252,539) | 169,439 | (157,336)
Cash flows from financing activities: |  |  |
Net proceeds from issuance of common stock under stock plans | 63,292 | 125,715 | 64,581
Repurchase of common stock | (161,652) | (51,036) | (61,690)
Payment of dividends | (43,263) | (390,508) | (35,124)
Payment of Chiaro contingent consideration | 0 | (1,039) | 0
Net cash used in financing activities | (141,623) | (316,868) | (32,233)
Effect of foreign exchange rate changes on cash and cash equivalents | (2,815) | 2,671 | (523)
Net change in cash and cash equivalents | (82,912) | 97,642 | 63,219
Cash and cash equivalents at beginning of year | 269,073 | 171,431 | 108,212
Cash and cash equivalents at end of year | $ 186,161 | $ 269,073 | $ 171,431

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