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Commitments and Contingencies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) Officer | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Operating Leased Assets [Line Items] |  |  |
Rent expense | $ 30.3 | $ 28.3 | $ 25.6
Renewal period of employment agreements | 2 years |  |
Expiration date | Dec. 31, 2019 |  |
Future compensation - 2017 | $ 23.2 |  |
Future compensation - 2018 through 2021 | $ 14.8 |  |
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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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Details
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