Note 10 - ¾% Notes	12 Months Ended
Dec. 31, 2012
Debt Disclosure [Text Block]	Note 10. ¾% Notes In December 2003, the Company issued $225.0 million in aggregate principal amount of 3/4% Notes. The issuance costs associated with the 3/4% Notes totaled $6.8 million, which was amortized to interest expense over five years, and the net proceeds to the Company from the offering of the 3/4% Notes were $218.2 million. The Company pays cash interest at an annual rate of 3/4% of the principal amount at issuance, payable semi-annually on June 22 and December 22 of each year. The 3/4% Notes are subordinated to all existing and future senior indebtedness of the Company. The Company does not apply the accounting standard issued in May 2008 by the FASB with regard to applying a nonconvertible debt borrowing rate on its 3/4% Notes, as the 3/4% Notes may not be settled in cash or other assets upon conversion. The 3/4% Notes are convertible at the option of the holders into shares of the Company’s common stock, par value $0.001 per share, only under the following circumstances: (1) prior to December 22, 2021, on any date during a fiscal quarter if the closing sale price of the Company’s common stock was more than 120% of the then current conversion price of the 3/4% Notes for at least 20 trading days in the period of the 30 consecutive trading days ending on the last trading day of the previous fiscal quarter, (2) on or after December 22, 2021, if the closing sale price of the Company’s common stock was more than 120% of the then current conversion price of the 3/4% Notes, (3) if the Company elects to redeem the 3/4% Notes, (4) upon the occurrence of specified corporate transactions or significant distributions to holders of the Company’s common stock occur or (5) subject to certain exceptions, for the five consecutive business day period following any five consecutive trading day period in which the average trading price of the 3/4% Notes was less than 98% of the average of the sale price of the Company’s common stock during such five-day trading period multiplied by the 3/4% Notes then current conversion rate. Subject to the above conditions, each $1,000 principal amount of 3/4% Notes is convertible into approximately 8.5441 shares of the Company’s common stock (equivalent to an initial conversion price of approximately $117.04 per share of common stock). In fiscal 2010, the Company repurchased a total of $0.1 million at a price equal to 100% of the principal amount of the 3/4% Notes. At December 31, 2012 and 2011, the Company had a remaining liability of $0.3 million of aggregate principal amount related to its 3/4% Notes. Each remaining holder of the 3/4% Notes may require the Company to purchase all or a portion of its 3/4% Notes on December 22, 2013, on December 22, 2018 or upon the occurrence of a change of control (as defined in the indenture governing the 3/4% Notes) at a price equal to the principal amount of 3/4% Notes being purchased plus any accrued and unpaid interest and the Company may redeem some or all of the 3/4% Notes for cash at a redemption price equal to 100% of the principal amount of the notes being redeemed, plus accrued interest to, but excluding, the redemption date. The Company may seek to make open market repurchases of the remaining balance of its 3/4% Notes within the next twelve months.

Note 10 - ¾% Notes

12 Months Ended

Dec. 31, 2012

Note 10. ¾% Notes

In December 2003, the Company issued $225.0 million in aggregate principal amount of 3/4% Notes. The issuance costs associated with the 3/4% Notes totaled $6.8 million, which was amortized to interest expense over five years, and the net proceeds to the Company from the offering of the 3/4% Notes were $218.2 million. The Company pays cash interest at an annual rate of 3/4% of the principal amount at issuance, payable semi-annually on June 22 and December 22 of each year. The 3/4% Notes are subordinated to all existing and future senior indebtedness of the Company. The Company does not apply the accounting standard issued in May 2008 by the FASB with regard to applying a nonconvertible debt borrowing rate on its 3/4% Notes, as the 3/4% Notes may not be settled in cash or other assets upon conversion.

The 3/4% Notes are convertible at the option of the holders into shares of the Company’s common stock, par value $0.001 per share, only under the following circumstances: (1) prior to December 22, 2021, on any date during a fiscal quarter if the closing sale price of the Company’s common stock was more than 120% of the then current conversion price of the 3/4% Notes for at least 20 trading days in the period of the 30 consecutive trading days ending on the last trading day of the previous fiscal quarter, (2) on or after December 22, 2021, if the closing sale price of the Company’s common stock was more than 120% of the then current conversion price of the 3/4% Notes, (3) if the Company elects to redeem the 3/4% Notes, (4) upon the occurrence of specified corporate transactions or significant distributions to holders of the Company’s common stock occur or (5) subject to certain exceptions, for the five consecutive business day period following any five consecutive trading day period in which the average trading price of the 3/4% Notes was less than 98% of the average of the sale price of the Company’s common stock during such five-day trading period multiplied by the 3/4% Notes then current conversion rate. Subject to the above conditions, each $1,000 principal amount of 3/4% Notes is convertible into approximately 8.5441 shares of the Company’s common stock (equivalent to an initial conversion price of approximately $117.04 per share of common stock).

In fiscal 2010, the Company repurchased a total of $0.1 million at a price equal to 100% of the principal amount of the 3/4% Notes. At December 31, 2012 and 2011, the Company had a remaining liability of $0.3 million of aggregate principal amount related to its 3/4% Notes. Each remaining holder of the 3/4% Notes may require the Company to purchase all or a portion of its 3/4% Notes on December 22, 2013, on December 22, 2018 or upon the occurrence of a change of control (as defined in the indenture governing the 3/4% Notes) at a price equal to the principal amount of 3/4% Notes being purchased plus any accrued and unpaid interest and the Company may redeem some or all of the 3/4% Notes for cash at a redemption price equal to 100% of the principal amount of the notes being redeemed, plus accrued interest to, but excluding, the redemption date. The Company may seek to make open market repurchases of the remaining balance of its 3/4% Notes within the next twelve months.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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