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Other Commitments (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other Commitments [Abstract]    
Lease Expiration Date Dec. 31, 2024  
Operating Leases, Rent Expense, Net $ 13,152 $ 9,818
Purchase commitments $ 11,422