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v3.3.1.900

Convertible Notes (Narrative) (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 16, 2013 USD ($) $ / shares | Jun. 29, 2009 USD ($) shares $ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jul. 10, 2009 USD ($)
Events of default |  |  |  |  |  |
Additional paid in capital |  |  | $ 1,130,368,000 | $ 1,153,435,000 |  |
Convertible notes |  |  |  |  |  |
Events of default |  |  |  |  |  |
Additional paid in capital |  |  | 93,400,000 | 93,400,000 |  |
Convertible notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face Value | $ 138,000,000 |  | $ 138,000,000 | 138,000,000 |  |
Liability Component, Principal amount | 107,700,000 |  |  |  |  |
Equity Component, Principal amount | $ 30,300,000 |  |  |  |  |
Debt discount amortization period | 5 years |  | 32 months |  |  |
Stated Interest rate (as a percent) | 1.125% |  | 1.125% |  |  |
Debt Issuance Cost | $ 3,600,000 |  |  |  |  |
Debt Issuance Cost, Convertible, Liability Component | 2,800,000 |  |  |  |  |
Debt Issuance Cost, Convertible, Equity Component | $ 800,000 |  |  |  |  |
Debt Instrument, Term | 5 years |  |  |  |  |
Conversion rate, number of shares to be issued per $1000 of principal (in shares) | 82.8329 |  |  |  |  |
Principal amount of notes used as the denominator to determine number of shares converted into notes | $ 1,000 |  |  |  |  |
Initial conversion price of notes (in dollars per share) | $ / shares | $ 12.07 |  |  |  |  |
Number of trading days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable, minimum | 20 days |  |  |  |  |
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be redeemable | 30 days |  |  |  |  |
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be convertible | 130.00% |  |  |  |  |
Number of business days immediately after any ten consecutive trading day period during the note measurement period | 5 days |  |  |  |  |
Number of consecutive trading days before the five business days during the debt instrument measurement period | 5 days |  |  |  |  |
Denomination of the principal amount of notes used to calculate the percent of trading price during the debt instrument measurement period | $ 1,000 |  |  |  |  |
Maximum conversion price as a percentage of closing stock price | 98.00% |  |  |  |  |
Percentage of face amount of debt instrument redeemable at the company's option | 100.00% |  |  |  |  |
Events of default |  |  |  |  |  |
Period of default in payment of interest (in days) | 30 days |  |  |  |  |
Period of default to comply with other agreements (in days) | 60 days |  |  |  |  |
Minimum percentage of aggregate outstanding principal required for default event with other agreements | 25.00% |  |  |  |  |
Minimum principal amount of debt nonpayment required for debt default to occur | $ 40,000,000 |  |  |  |  |
Period of nonpayment of principal amount required for debt default to occur (in days) | 30 days |  |  |  |  |
Minimum percentage of aggregate outstanding principal required for nonpayment of debt default to occur | 25.00% |  |  |  |  |
Minimum percentage of aggregate outstanding principal required for immediate payment declaration to occur | 25.00% |  |  |  |  |
Convertible notes | 5% Convertible Senior Notes due 2014 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face Value |  | $ 150,000,000 |  |  |  | $ 22,500,000
Liability Component, Principal amount |  | 92,400,000 |  |  |  | 14,300,000
Equity Component, Principal amount |  | $ 57,600,000 |  |  |  | $ 8,200,000
Debt discount amortization period |  | 5 years |  |  |  |
Stated Interest rate (as a percent) |  | 5.00% |  |  |  |
Debt Issuance Cost |  | $ 5,100,000 |  |  |  |
Debt Issuance Cost, Convertible, Liability Component |  | 3,200,000 |  |  |  |
Debt Issuance Cost, Convertible, Equity Component |  | $ 1,900,000 |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |
Periodic interest payment |  |  |  | $ 4,300,000 | $ 8,600,000 |
Conversion rate, number of shares to be issued per $1000 of principal (in shares) |  | 51.8 |  |  |  |
Principal amount of notes used as the denominator to determine number of shares converted into notes |  | $ 1,000 |  |  |  |
Initial conversion price of notes (in dollars per share) | $ / shares |  | $ 19.31 |  |  |  |
Number of trading days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable, minimum |  | 20 days |  |  |  |
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be redeemable |  | 30 days |  |  |  |
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be convertible |  | 130.00% |  |  |  |
Number of business days immediately after any ten consecutive trading day period during the note measurement period |  | 5 days |  |  |  |
Number of consecutive trading days before the five business days during the debt instrument measurement period |  | 10 days |  |  |  |
Denomination of the principal amount of notes used to calculate the percent of trading price during the debt instrument measurement period |  | $ 1,000 |  |  |  |
Maximum conversion price as a percentage of closing stock price |  | 98.00% |  |  |  |
Number of trading days conversion reference period |  | 20 days |  |  |  |
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be redeemable at the company's option |  | 30 days |  |  |  |
Percentage of face amount of debt instrument redeemable at the company's option |  | 100.00% |  |  |  |
Number of trading days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable at the company's option, minimum |  | 20 days |  |  |  |
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be redeemable at the company's option |  | 130.00% |  |  |  |
Percentage of face amount which may be redeemed by the debt holder for cash upon occurrence of a fundamental change |  | 100.00% |  |  |  |
Maximum increase in conversion rate per $1000 principal amount upon occurrence of fundamental change | shares |  | 15.5401 |  |  |  |
Events of default |  |  |  |  |  |
Period of default in payment of interest (in days) |  | 30 days |  |  |  |
Period of default to comply with other agreements (in days) |  | 60 days |  |  |  |
Minimum percentage of aggregate outstanding principal required for default event with other agreements |  | 25.00% |  |  |  |
Minimum principal amount of debt nonpayment required for debt default to occur |  | $ 30,000,000 |  |  |  |
Period of nonpayment of principal amount required for debt default to occur (in days) |  | 10 days |  |  |  |
Minimum percentage of aggregate outstanding principal required for nonpayment of debt default to occur |  | 25.00% |  |  |  |
Minimum percentage of aggregate outstanding principal required for immediate payment declaration to occur |  | 25.00% |  |  |  |
Convertible Senior Notes [Member] | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated Interest rate (as a percent) | 1.125% |  | 1.125% | 1.125% |  |
Convertible Senior Notes [Member] | 5% Convertible Senior Notes due 2014 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated Interest rate (as a percent) |  |  | 5.00% | 5.00% | 5.00% |
Events of default |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 172,500,000 |  |

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- Definition The minimum number of trading days within a period of 30 consecutive trading days in which the closing price of the reporting entity's common stock must exceed the applicable conversion price in order for the debt instruments to be eligible for redemption at the reporting entity's option. + References No definition available. + Details
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