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Commitments and Contingencies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Officer | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Operating Leased Assets [Line Items] |  |  |
Rent expense | $ 34.8 | $ 30.3 | $ 28.3
Renewal period of employment agreements | 2 years |  |
Expiration date | Dec. 31, 2018 |  |
Future compensation - 2018 | $ 30.1 |  |
Future compensation - 2019 through 2022 | $ 15.6 |  |
Executive Officer [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Number of officers with the company had employee agreement | Officer | 3 |  |
Minimum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating leases renewal period | 1 year |  |
Maximum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating leases renewal period | 5 years |  |

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