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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 Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second and third fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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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://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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