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Lease Commitments - Supplemental Cash Flow (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Leases [Abstract]      
Operating cash flows for operating leases $ 37,091,000 $ 38,906,000  
Right-of-use assets obtained in exchange for lease obligations 40,535,000 30,056,000  
Operating lease right-of-use assets, net $ 109,315,000 $ 102,354,000 $ 122,300,000