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Financing Arrangements (Narrative) (Details) (USD $) | 1 Months Ended | 9 Months Ended |  |  |  |  |  | 1 Months Ended
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Aug. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Jul. 31, 2014 | Dec. 31, 2013 | Aug. 12, 2014 Common Stock | Sep. 30, 2014 2019 convertible senior notes | Dec. 31, 2013 2019 convertible senior notes | Aug. 31, 2014 Senior Notes | Aug. 31, 2014 Senior Notes 2019 convertible senior notes | Aug. 31, 2014 Senior Notes 2019 convertible senior notes Debt Instrument, Redemption, Period One D | Aug. 31, 2014 Senior Notes 2019 convertible senior notes Debt Instrument, Redemption, Period Two D
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  | $ 245,000,000 |  |
Aggregate principal amount outstanding |  |  |  |  |  |  | 245,000,000 | 0 |  | 245,000,000 |  |
Debt discount rate |  |  |  |  |  |  |  |  |  | 5.83% |  |
Initial debt value |  | 193,631,000 |  |  | 0 |  | 193,631,000 | 0 |  | 192,500,000 |  |
Additional final payment on borrowings |  |  |  | 6.00% |  |  |  |  |  |  |  |
Net proceeds from note after debt issuance costs |  |  |  |  |  |  |  |  |  | 239,300,000 |  |
Initial conversion rate |  |  |  |  |  |  |  |  |  | 0.0133251 |  |
Initial conversion price |  |  |  |  |  |  |  |  |  | $ 75.05 |  |
Premium percentage |  |  |  |  |  |  |  |  |  | 35.00% |  |
Share price |  |  |  |  |  | $ 55.59 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 0.75% |  |
Threshold trading days |  |  |  |  |  |  |  |  |  |  | 20 | 5
Consecutive trading days |  |  |  |  |  |  |  |  |  |  | 30 days | 10 years
Percentage of stock price trigger |  |  |  |  |  |  |  |  |  |  | 130.00% |
Maximum threshold percentage of debt trading price trigger |  |  |  |  |  |  |  |  |  |  |  | 98.00%
Debt issuance costs |  |  |  |  |  |  |  |  |  | 5,700,000 |  |
Equity component of convertible debt recorded as a reduction to additional paid-in capital |  |  |  |  |  |  |  |  |  | 1,200,000 |  |
Long-term debt issuance costs |  | 3,598,000 |  |  | 0 |  |  |  |  | 4,500,000 |  |
Term of notes |  |  |  |  |  |  |  |  |  | 5 years |  |
Carrying value of the equity component of debt, net of issuance costs |  |  |  |  |  |  |  |  |  | 51,300,000 |  |
Exercise price | $ 125.08 |  |  |  |  |  |  |  |  |  |  |
Payment for convertible bond hedges |  | 48,143,000 | 0 |  |  |  |  |  | 48,143,000 |  |  |
Common stock, shares available to be issued | 3,264,643 |  |  |  |  |  |  |  |  |  |  |
Exercise Price of Convertible Bond Hedge | $ 75.05 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of warrants | $ 11,600,000 |  |  |  |  |  |  |  |  |  |  |

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