Quarterly report pursuant to Section 13 or 15(d)

Leases (Lease Expense) (Details)

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Leases (Lease Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease expense $ 5,577 $ 11,050
Variable lease expenses 469 676
Short-term and other lease expenses 528 954
Total lease expense $ 6,574 $ 12,680