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Leases (Components Of Lease Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Lease Expense    
Operating lease expense [1] $ 11,573 $ 23,098
Sublease income [1]   (6)
Net lease expense [1] $ 11,573 $ 23,092
[1] Includes short-term leases and variable lease costs, which are immaterial. Included in both cost of services provided and goods sold and selling, general and administrative expenses.