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Leases Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Amortization of right-of-use assets $ 35 $ 99
Interest on lease liabilities 10 32
Operating lease cost 4,105 11,469
Short-term lease cost 160 294
Total lease cost $ 4,310 $ 11,894