Annual report pursuant to Section 13 and 15(d)

Leases (Narrative) (Details)

v3.20.1
Leases (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Lessee, Lease, Description [Line Items]      
Joint owner obligation     $ 24,900
Future lease liabilities     $ 36,095
Rent expense, operating leases $ 17,000 $ 19,100  
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Lease terms     45 months
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Lease terms     21 months