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Lease Commitments - Supplemental Cash Flow (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
[1]
Jan. 01, 2019
Leases [Abstract]            
Operating cash flows for operating leases $ 9,418,000 $ 9,806,000 $ 27,933,000 $ 29,220,000    
Right-of-use assets obtained in exchange for lease obligations 8,204,000 $ 1,294,000 31,061,000 $ 13,310,000    
Operating lease right-of-use assets, net $ 107,956,000   $ 107,956,000   $ 102,354,000 $ 122,300,000
[1] Derived from the audited Consolidated Balance Sheet