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Leases (Tables)
 9 Months Ended
Sep. 30, 2020
Leases [Abstract]  
Components of Lease Cost The components of lease cost were as follows:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(in thousands)2020201920202019
Operating lease cost$8,343 $5,481 $24,319 $16,263 
Short-term lease cost475 522 1,744 1,996 
Variable lease cost553 501 1,700 1,331 
Total lease cost$9,371 $6,504 $27,763 $19,590