Debt	6 Months Ended
Debt	Jun. 30, 2011
Debt
Debt	NOTE 7 DEBT On March 12, 2008, the Company issued and sold $181.5 million aggregate principal amount of senior convertible debentures due March 15, 2028 ("debentures"). The debentures pay interest at 1.875% per annum, payable semi-annually on March 15 and September 15 of each year, and commenced on September 15, 2008. The debentures will mature on March 15, 2028, subject to earlier repurchase or conversion. Each $1,000 principal amount of debentures is initially convertible, at the option of the holders, into approximately 42.5351 shares of the Company's common stock, at any time prior to the maturity date. The conversion rate is subject to certain adjustments, but will not be adjusted for accrued interest or any unpaid interest. The conversion rate initially represents a conversion price of $23.51 per share. Holders of the debentures may require the Company to repurchase all or a portion of their debentures on March 15, 2013, March 15, 2018 and March 15, 2023, or at any time before March 15, 2028 upon the occurrence of certain events including a change in control. The Company may redeem the debentures for cash beginning on or after March 22, 2013. In October 2009, the Company undertook the exchange of $15.0 million face amount of the convertible debentures for 1.84 million shares of the Company's common stock. The debentures so acquired were retired. There is $166.5 million face value of the debentures outstanding as of June 30, 2011. Amortization expense related to the issuance costs of the debentures was approximately $0.2 million for each of the three- month periods ended June 30, 2011 and 2010, respectively, and $0.5 million for each of the six- month periods ended June 30, 2011 and 2010, respectively. The interest expense on the debentures was approximately $0.8 million, respectively, for each of the three- month periods ended June 30, 2011 and 2010, and $1.6 million, respectively, for each of the six-month periods ended June 30, 2011 and 2010. The Company made cash payments of $1.6 million for interest on the debentures for each of the six- month periods ended June 30, 2011 and 2010, respectively. The Company also has outstanding a $30.0 million offering of 8.0% Exempt Facility Revenue Bonds, Series 2000, issued through the State of Montana Board of Investments and due July 1, 2020. The balance outstanding at June 30, 2011, was $29.5 million, which is net of unamortized discount of $0.5 million. Subsequent to June 30, 2011, in connection with the signing of the Peregrine arrangement agreement on July 11, 2011, the Company received a bridge capital loan commitment of $200.0 million in order to provide for additional working capital support if needed following the closing of the Peregrine acquisition.

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.

+ References+ Details