Annual report pursuant to Section 13 and 15(d)

Leases (Details)

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Leases (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease expense $ 31,596
Variable lease expense 14,284
Short-term lease expense 50,832
Finance lease cost:  
Amortization of right-to-use assets 1,765
Interest on lease liabilities 1,239
Operating lease revenue 446
Sublease income $ 1,615