Commitments and Contingencies Sublease Income, Leased Facilities (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Commitments and Contingencies Disclosure [Abstract] | ||
| Operating Leases, Income Statement, Sublease Revenue | $ 2.4 | $ 2.1 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The amount of revenue recognized for the period under subleasing arrangements. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|