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Condensed Consolidated Statements of Cash Flows (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 153,048,925 | $ 128,988,206
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 42,334,977 | 37,620,512
Loss on disposal of assets | 2,114,241 | 327,382
Gain on sale of investments | (15,121,583) | (8,420,229)
Loss on sale of investments | 805,805 | 841,274
Deferred income taxes | (6,271,382) | 2,923,004
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 12,528,264 | 12,361,993
Excess tax benefits from stock-based compensation | (2,275,233) | (641,072)
Change in operating assets and liabilities: |  |
Accounts receivable, net | (31,755,237) | (15,882,832)
Inventories | 42,523,707 | 11,633,857
Prepaid expenses and other | (12,362) | 4,403,912
Accounts payable | 7,139,387 | (13,236,250)
Accrued liabilities, excluding dividends declared | 18,606,444 | 15,529,686
Net cash provided by operating activities | 223,665,953 | 176,449,443
Activity in available-for-sale securities: |  |
Sales proceeds | 69,937,242 | 31,564,139
Maturities and calls | 98,142,408 | 70,652,000
Purchases | (58,278,107) | (63,441,410)
Plant and equipment additions | (38,026,769) | (97,597,283)
Proceeds from sale of plant and equipment | 316,449 | 1,012,608
Acquisition of businesses, net of cash acquired | (698,107,014) | 0
(Increase) decrease in other assets | (602,017) | (16,036,911)
Net cash (used for) provided by investing activities | (626,617,808) | (73,846,857)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from borrowings on Credit Agreement | 275,000,000 | 0
Financing costs paid | (953,800) | 0
Issuance of common stock from stock plan transactions | 22,526,742 | 8,417,982
Cash dividends paid | (58,898,029) | (54,829,734)
Repurchases of common stock | 0 | (33,716,725)
Excess tax benefits from stock-based compensation | 2,275,233 | 641,072
Net cash provided by (used for) financing activities | 239,950,146 | (79,487,405)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (163,001,709) | 23,115,181
CASH AND CASH EQUIVALENTS, beginning of period | 389,678,664 | 357,986,774
CASH AND CASH EQUIVALENTS, end of period | $ 226,676,955 | $ 381,101,955

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