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Leases (Components of Lease Cost Reported in General and Administrative Expenses in Condensed Consolidated Statements of Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease costs $ 1,558 $ 3,204
Short-term lease costs 96 160
Total lease cost $ 1,654 $ 3,364