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Subsequent Events (Details) - USD ($) | May 01, 2018 | Apr. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2013
--- | --- | --- | --- | ---
Convertible Debt | Convertible Senior Notes Due 2018 |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Amount of debt repurchased |  |  | $ 37,000,000 |
Debt Instrument interest rate |  |  |  | 4.625%
Subsequent Event | 5 Arches, LLC |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Minority interest, purchase agreement | 20.00% |  |  |
Purchase agreement, preliminary amount | $ 10,000,000 |  |  |
Purchase agreement, option to purchase remaining amount period | 1 year |  |  |
Purchase agreement, potential remaining purchase amount | $ 40,000,000 |  |  |
Subsequent Event | Convertible Debt | Convertible Senior Notes Due 2018 |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Amount of debt repurchased |  | $ 250,000,000 |  |
Debt Instrument interest rate |  | 4.625% |  |

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