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Condensed Consolidated Statements Of Cash Flows (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 87,111,123 | $ 80,805,051
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 25,138,931 | 21,283,279
(Gain) loss on disposal of assets | 397,298 | 539,865
(Gain) loss on sale of investments | (4,235,900) | (5,177,464)
Deferred income taxes | 1,729,418 | 7,328,085
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 7,991,705 | 6,419,575
Excess tax benefits from stock-based compensation | (586,535) | (2,599,659)
Change in operating assets and liabilities: |  |
Accounts receivable, net | (19,558,762) | (16,211,416)
Inventories | (3,576,693) | (18,728,798)
Prepaid expenses and other | 3,305,799 | 765,712
Accounts payable | (11,955,646) | 22,987,528
Accrued liabilities, excluding dividends declared | 15,768,179 | 7,203,272
Net cash provided by (used for) operating activities | 101,528,917 | 104,615,030
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Plant and equipment additions | (69,424,380) | (48,995,466)
Proceeds from sale of plant and equipment | 10,803 | 77,509
(Increase) decrease in investments | 14,340,148 | 53,504,964
(Increase) decrease in other assets | (725,542) | 2,474,000
Net cash provided by (used for) investing activities | (55,798,971) | 7,061,007
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Issuance of common stock from stock plan transactions | 7,439,914 | 14,775,493
Cash dividends paid | (36,036,136) | (32,781,030)
Excess tax benefits from stock-based compensation | 586,535 | 2,599,659
Net cash provided by (used for) financing activities | (28,009,687) | (15,405,878)
NET INCREASE IN CASH AND CASH EQUIVALENTS | 17,720,259 | 96,270,159
CASH AND CASH EQUIVALENTS, beginning of period | 357,986,774 | 348,349,773
CASH AND CASH EQUIVALENTS, end of period | $ 375,707,033 | $ 444,619,932

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