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Commitments and Contingencies (Lease Commitments) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) lease	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lease Commitments
Number of operating leases | lease	3
Rent expense	$ 2.7	$ 2.7	$ 2.7
Corporate headquarters
Lease Commitments
Lease cost	$ 2.6
New Corporate Headquarters Location
Lease Commitments
Term of lease	15 years
Renewal term	5 years
Future rent payments for new office location	$ 4.6

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- Definition

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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