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Lease Commitments - Supplemental Cash Flow (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
[1]
Jan. 01, 2019
Leases [Abstract]            
Operating cash flows for operating leases $ 9,019,000 $ 9,818,000 $ 18,514,000 $ 19,414,000    
Right-of-use assets obtained in exchange for lease obligations 6,684,000 $ 7,796,000 22,857,000 $ 12,016,000    
Operating lease right-of-use assets, net $ 106,508,000   $ 106,508,000   $ 102,354,000 $ 122,300,000
[1] Derived from the audited Consolidated Balance Sheet