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Long-Term Debt (Convertible Senior Notes Dues 2032) (Details) (USD $) | 9 Months Ended | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Mar. 31, 2012 Convertible Senior Notes 2032 [Member] | Sep. 30, 2014 Convertible Senior Notes 2032 [Member] | Mar. 31, 2012 Convertible Senior Notes 2025 [Member] | Mar. 31, 2005 Convertible Senior Notes 2025 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt, carrying value | $ 576,042,000 |  | $ 200,000,000 | $ 200,000,000 | [1] |  |
Debt instrument interest rate |  |  | 3.25% |  |  |  | 3.25%
Proceeds from issuance of debt |  |  | 195,000,000 |  |  |  |
Debt instrument, repurchase amount |  |  |  |  |  | 142,200,000 |
Debt instrument, frequency of periodic payment |  |  |  | semi-annually |  |  |
Debt intstrument, maturity date |  |  |  | Mar. 15, 2032 |  |  |
Convertible Senior Notes, shares of common stock |  |  |  | 39.9752 |  |  |
Base principal amount |  |  |  | 1,000 |  |  |
Per share conversion price |  |  |  | $ 25.02 |  |  |
Debt instrument, redemption price, percentage of principal amount redeemed |  |  |  | 100.00% |  |  |
Unamortized debt discount | $ 22,367,000 | [2] | $ 35,400,000 | $ 22,367,000 | [1],[2] |  |
Expected life used to estimate fair value | 6 years |  |  |  |  |  |
Effective interest rate |  |  |  | 6.90% |  |  |
[1] | Beginning in March 2018, the holders of our Convertible Senior Notes due 2032 may require us to repurchase these notes or we may at our option elect to repurchase these notes. The notes will mature in March 2032.
[2] | Our Convertible Senior Notes due 2032 will increase to their face amount through accretion of non-cash interest charges through March 2018.

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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