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Leases and Right of Use Assets - Lease Cost and Other Information (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Cash paid for amounts included in measurement of liabilities:  
Operating cash flows from operating leases $ 3,885
Operating cash flows from finance leases 603
Financing cash flows from finance leases 6,202
ROU assets obtained in exchange for lease liabilities:  
Operating leases 931
Finance leases $ 16,303