In October 2006, the Company issued and sold Notes with an aggregate principal amount of $230 million due 2026, which pay 2.25% interest per annum on the principal amount of the Notes, payable semi-annually in arrears on April 1 and October 1 of each year.

On October 1, 2011, and every five years thereafter, holders may require the Company to purchase all or a portion of their Notes at a purchase price in cash equal to 100% of the principal amount of the Notes to be purchased, plus any accrued and unpaid interest to, but excluding, the purchase date. Therefore, the Company has classified its Notes as a current liability. Should the holders choose not to require the Company to purchase their Notes on October 1, 2011, the Company has the option to call the Notes, which it intends to do. Should the holders choose to require the Company to purchase its Notes or if the Company exercises its option, either will require the Company to use available funds and/or seek alternative means to service the debt.

The Notes can be converted into cash or, at the Company's option, cash and/or shares of the Company's Common Stock based on an initial conversion rate, subject to adjustment, of 25.6419 shares (split adjusted) per $1,000 principal amount of Notes, which represents an initial conversion price of $39.00 per share (split adjusted), in certain circumstances. In addition, following a “make-whole fundamental change” that occurs prior to October 1, 2011, the Company may, at its option, increase the conversion rate for a holder who elects to convert its Notes in connection with such “make-whole fundamental change,” in certain circumstances.

In determining the liability and equity components, the Company determined the expected life of the Notes to be five years as that is the earliest date in which the Notes can be put back to the Company at par value. As of June 30, 2011, three months remain over which the discount of the liability will be amortized. As of June 30, 2011, the liability and equity components are as follows (in thousands):

	Liability Component Principal Amount			Liability Component Net Carrying Amount			Liability Component Unamortized Discount			Equity Component Carrying Amount
$	134,293		$	132,272		$	2,021		$	35,515

The effective interest rate of the liability component is 8.5%, which is a comparable yield for nonconvertible notes with terms and conditions otherwise comparable to the Company's Notes as of the date of issuance. The amount of interest expense, including amortization of debt discount for the liability component and debt issuance costs is as follows (in thousands):

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2011		2010		2011		2010
Notes contractual interest expense	$	754	$	792	$	1,510	$	1,552
Amortization of debt discount		2,027		1,873		4,011		3,707
Amortization of debt issuance costs		138		136		275		274
Total	$	2,919	$	2,801	$	5,796	$	5,533