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Leases (Supplemental Cash Flow Information) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases $ 46,192
Operating cash flows from finance leases 1,141
Financing cash flows from finance leases 7,717
ROU assets obtained in exchange for lease obligations  
Operating leases 39,515
Finance leases $ 0