Subsequent Events (Details) - USD ($)
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Jan. 14, 2019 |
Dec. 31, 2018 |
Aug. 18, 2016 |
May 20, 2014 |
| Subsequent Event [Line Items] |
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| Outstanding balance |
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$ 2,084,302,000
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| Unsecured Debt |
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| Subsequent Event [Line Items] |
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|
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| Outstanding balance |
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300,000,000
|
|
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| Stated rate |
|
|
4.45%
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|
| Convertible Notes |
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| Subsequent Event [Line Items] |
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| Outstanding balance |
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$ 747,500,000
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|
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| Convertible Senior Notes Due 2019 | Convertible Notes |
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| Subsequent Event [Line Items] |
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| Stated rate |
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|
|
2.875%
|
| Revolving Credit Facility | Credit Facility 2019 | Unsecured Debt | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Maximum borrowing capacity |
$ 800,000,000.0
|
|
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| Facility fee percentage |
0.25%
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|
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| Increased borrowing capacity under accordion feature |
$ 400,000,000
|
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| Term Loan | A-1 Term Loan | Unsecured Debt | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Maximum borrowing capacity |
420,000,000.0
|
|
|
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| Increased borrowing capacity under accordion feature |
200,000,000
|
|
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| Term Loan | A-2 Term Loan | Unsecured Debt | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Maximum borrowing capacity |
$ 400,000,000.0
|
|
|
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| Ticking fee percentage |
0.20%
|
|
|
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| Outstanding balance |
$ 0
|
|
|
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| Increased borrowing capacity under accordion feature |
$ 200,000,000
|
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| LIBOR | Revolving Credit Facility | Credit Facility 2019 | Unsecured Debt | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Basis spread on variable rate |
1.10%
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| LIBOR | Term Loan | A-1 Term Loan | Unsecured Debt | Subsequent Event |
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| Subsequent Event [Line Items] |
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|
|
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| Basis spread on variable rate |
1.25%
|
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| LIBOR | Term Loan | A-2 Term Loan | Unsecured Debt | Subsequent Event |
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| Subsequent Event [Line Items] |
|
|
|
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| Basis spread on variable rate |
1.25%
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