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Leases (Supplemental Cash Flow Information Related to Leases) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities  
Operating cash flows from operating leases $ 5,854
Operating cash flows from interest on finance leases 38
Financing cash flows from finance leases 1,217
Right-of-use assets obtained in exchange for lease obligations  
Operating leases 294
Finance leases $ 0