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Operating Leases (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jan. 01, 2019
Operating Leases [Line Items]      
Rent expenses $ 3,200 $ 5,400  
Accounting Standards Update 2016-02 [Member]      
Operating Leases [Line Items]      
Lease standard initial adoption     $ (736)