Leases - (Details)	3 Months Ended
	Mar. 31, 2020
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term in years for operating leases	37 years 5 months
Oakwood Lease [Member]
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term in years for operating leases	17 years
Lessee, Operating Lease, Number Of Renewal Options	6
Lessee, operating lease, renewal term	5 years
Oxford Lease [Member]
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term in years for operating leases	41 years
Lessee, Operating Lease, Number Of Renewal Options	0
Other Leases [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term	5 years
Fairfield Office Lease [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Minimum [Member] | Other Leases [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Remaining Lease Term	1 year
Maximum [Member] | Other Leases [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Remaining Lease Term	6 years