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Leases (Narrative) (Details)
3 Months Ended
Mar. 31, 2019
subleased_property
Lessee, Lease, Description [Line Items]  
Lease extension term 5 years
Lease termination period 1 year
Number of real estate properties 4
Weighted-average remaining lease term - finance leases 1 year 2 months 27 days
Weighted-average remaining lease term - operating leases 6 years 11 months 23 days
Weighted-average discount rate - finance leases 15.10%
Weighted-average discount rate - operating leases 13.50%
Minimum  
Lessee, Lease, Description [Line Items]  
Remaining lease terms 1 year
Remaining lease term for sublease 2 years
Maximum  
Lessee, Lease, Description [Line Items]  
Remaining lease terms 10 years
Remaining lease term for sublease 9 years