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Leases (Tables)
 6 Months Ended
Jun. 30, 2020
Leases [Abstract]  
Components of Lease Cost The components of lease cost were as follows:
Three Months Ended 
June 30,		Six Months Ended 
June 30,
(in thousands)2020201920202019
Operating lease cost$8,154  $5,873  $15,976  $10,782  
Short-term lease cost391  676  1,269  1,474  
Variable lease cost526  424  1,147  830  
Total lease cost$9,071  $6,973  $18,392  $13,086