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CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Supplemental disclosures of cash flow information-cash paid for:    
Interest $ 23,542 $ 25,904
Income taxes 3,765 3,356
Supplemental non-cash cash flow information:    
Fair market value of estimated contingent consideration in connection with acquisitions 6,332 50,945
Net tangible assets (liabilities) acquired in connection with business acquisitions (7,599) (3,888)
Operating lease assets 202,548 168,867
Operating lease liabilities $ 221,339 $ 180,451