Operating Leases - Narrative (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Leases [Abstract] | |||
| Rent expense | $ 11.0 | $ 10.1 | $ 8.5 |
| Termination fee to cancel sublease before end of term | $ 2.5 | ||
| X | ||||||||||
- Definition Amount of gain (loss) on termination of lease before expiration of lease term. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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