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Lease Commitments - Lease-Related Assets and Liabilities (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Jan. 01, 2019
Leases [Abstract]      
Operating lease right-of-use assets, net $ 107,956,000 $ 102,354,000 [1] $ 122,300,000
Current operating lease liabilities 31,918,000 30,765,000 [1]  
Noncurrent operating lease liabilities 91,963,000 87,064,000 [1]  
Total operating lease liabilities $ 123,881,000 $ 117,829,000  
Weighted-Average Remaining Lease Term 6 years 14 days 5 years 8 months 19 days  
Weighted-Average Discount Rate 5.30% 5.40%  
[1] Derived from the audited Consolidated Balance Sheet