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Convertible Notes (Narrative) (Details) $ / shares in Units, shares in Millions |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 17, 2017 USD ($) D $ / shares | Aug. 16, 2013 USD ($) D $ / shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Nov. 14, 2017 $ / shares | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Shares | shares |  |  | 9.1 | 9.1 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  | 9.1 | 9.1 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  | $ 23.30 | $ 23.30 |  |
Share Price | $ / shares |  |  |  |  | $ 14.56 |
Potential Incremental Common Shares Attributable To Dilutive Effect Of Conversion Of Debt Securities | shares |  |  | 9.1 |  |  |
Additional paid in capital |  |  | $ 1,212,798,000 | $ 1,212,798,000 |  | $ 1,181,230,000
Convertible notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Additional paid in capital |  |  | 111,300,000 | 111,300,000 |  | 93,400,000
Convertible notes | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stock Price Premium |  |  |  |  | 60.00% |
Face Value | $ 172,500,000 |  | 172,500,000 | 172,500,000 |  | 0
Liability Component, Principal amount | 137,300,000 |  |  |  |  |
Equity Component, Principal amount | $ 35,200,000 |  |  |  |  |
Debt discount amortization period | 5 years |  |  |  |  |
Debt Issuance Cost, Convertible, Liability Component | $ 2,600,000 |  |  |  |  |
Debt Issuance Cost, Convertible, Equity Component | 700,000 |  |  |  |  |
Debt Issuance Costs, Gross | $ 3,300,000 |  |  |  |  |
Conversion rate, number of shares to be issued per $1000 of principal (in shares) | 52.8318 |  |  |  |  |
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 | $ 18.93 |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | 20 |  |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | D | 30 |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | 130.00% |  |  |  |  |
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 | $ 40,000,000.0 |  |  |  |  |
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% |  |  |  |  |
Debt Instrument, Default Percent Of Principal And Accrued And Unpaid Interest | 100.00% |  |  |  |  |
Convertible notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face Value |  | $ 138,000,000 | 81,207,000 | $ 81,207,000 |  | $ 138,000,000
Liability Component, Principal amount |  | 107,700,000 |  |  |  |
Equity Component, Principal amount |  | $ 30,300,000 |  |  |  |
Debt discount amortization period |  | 5 years |  | 8 months |  |
Debt Issuance Cost, Convertible, Liability Component |  | $ 2,800,000 |  |  |  |
Debt Issuance Cost, Convertible, Equity Component |  | $ 800,000 |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |
Debt Issuance Costs, Gross |  | $ 3,600,000 |  |  |  |
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 |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days |  | 20 |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | D |  | 30 |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  | 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% |  |  |  |
Debt Instrument, Repurchase Amount |  |  | $ 56,800,000 | $ 56,800,000 |  |
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 Senior Notes [Member] | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated Interest rate (as a percent) | 1.375% |  | 1.375% | 1.375% |  |
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% |  | 1.125%

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