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Debt, Net - Convertible Notes (Details) - Convertible Notes | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 $ / shares | Jun. 30, 2017 USD ($) | Mar. 31, 2014 USD ($) | Jul. 31, 2013 USD ($)
2020 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issued | $ |  |  |  | $ 172,500,000.0
Stated interest rate (as a percent) | 3.00% |  |  | 3.00%
Initial conversion price (USD per share) | $ 45.72 |  |  |
Closing stock price at date of issuance (in dollars per share) | $ 33.35 |  |  |
Conversion rate (shares per $1,000 principal amount) | 21.8718 |  |  |
2021 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issued | $ |  |  | $ 161,000,000.0 |
Stated interest rate (as a percent) | 2.875% |  | 2.875% |
Initial conversion price (USD per share) | $ 59.39 |  |  |
Closing stock price at date of issuance (in dollars per share) | $ 47.51 |  |  |
Conversion rate (shares per $1,000 principal amount) | 16.8386 |  |  |
2022 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issued | $ |  | $ 150,000,000.0 |  |
Stated interest rate (as a percent) | 3.25% | 3.25% |  |
Initial conversion price (USD per share) | $ 45.57 |  |  |
Closing stock price at date of issuance (in dollars per share) | $ 35.05 |  |  |
Conversion rate (shares per $1,000 principal amount) | 21.9467 |  |  |

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