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Summary of Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 11,471  
Operating cash flows from finance leases 98  
Financing cash flows from finance leases 367 $ 229
Right-of-use assets obtained in exchange for lease obligations:    
Operating leases 31,685  
Finance leases $ 849