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Debt - Convertible Senior Notes (Details) | Mar. 06, 2017 USD ($) item $ / shares | Sep. 30, 2017 USD ($)
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Amended Credit Agreement |  |
Debt |  |
Repayment of debt | $ 72,500,000 |
1.375% Convertible Senior Notes |  |
Debt |  |
Principal amount of convertible senior notes sold in private placement | $ 400,000,000 | $ 400,000,000
Stated interest rate | 1.375% |
Conversion rate | 10.7744 |
Principal amount of notes | $ 1,000 |
Initial conversion price | $ / shares | $ 92.81 |
Number of trading days within 30 trading day period | item | 20 |
Number of consecutive trading days | 30 days |
Minimum amount the sales price of the Company's stock exceeds the conversion price (as a percent) | 130.00% |
Number of consecutive business days after the 10 consecutive trading day period | 5 days |
Number of consecutive trading days before the five consecutive business days | 10 days |
Maximum amount the sales price of the Company's stock exceeds the conversion price (as a percent) | 98.00% |

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- Definition Threshold number of specified consecutive business days that common stock price per $1,000 of convertible debt instruments must not exceed the threshold percentage within a specified consecutive trading period to trigger conversion feature. + References No definition available. + Details
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- Definition Threshold number of specified consecutive trading days that common stock price per $1,000 of convertible debt instruments must not exceed the threshold percentage, and which occurs before the specified consecutive business period to trigger conversion feature. + References No definition available. + Details
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