Leases (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) subleased_property sublease
Lessee, Lease, Description [Line Items]
Lease extension term (in years)	5 years
Lease termination period (in years)	1 year
Weighted-average remaining lease term - finance leases (in years)	1 year 8 months 12 days
Weighted-average remaining lease - operating leases (in years)	5 years 9 months 3 days
Weighted-average discount rate - finance leases	13.90%
Weighted-average discount rate - operating leases	13.50%
Impairment of right-of-use assets | $	$ 2.8
Number of real estate properties | subleased_property	7
Number of noncancelable short-term subleases	1
Number of remaining noncancelable subleased properties	6
Number of subleases containing options to renew or terminate agreement	0
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms (in years)	1 year
Remaining lease term for sublease (in years)	2 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms (in years)	7 years
Remaining lease term for sublease (in years)	7 years