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Leases (Finance And Operating Lease Cost) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Finance lease cost  
Amortization of right-of-use assets $ 574
Interest on lease liabilities 73
Total finance lease cost 647
Operating lease cost  
Fixed lease cost 3,174
Short-term lease cost 179
Variable lease cost 429
Sublease income (389)
Total operating lease cost 3,393
Cost of revenues  
Finance lease cost  
Amortization of right-of-use assets 421
Operating lease cost  
Total operating lease cost 1,101
Selling and marketing  
Finance lease cost  
Amortization of right-of-use assets 61
Operating lease cost  
Total operating lease cost 1,164
Research and development  
Finance lease cost  
Amortization of right-of-use assets 61
Operating lease cost  
Total operating lease cost 749
General and administrative  
Finance lease cost  
Amortization of right-of-use assets 31
Operating lease cost  
Total operating lease cost $ 379