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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Weighted average remaining lease term for operating leases 6 years 1 month 6 days   6 years 1 month 6 days  
Weighted average discount rate for operating leases 4.70%   4.70%  
Components of Lease Expense [Abstract]        
Operating lease cost $ 12,869 $ 12,417 $ 26,005 $ 25,278
Variable lease cost 410 1,105 1,384 2,157
Short-term lease cost 95 52 140 104
Sublease income (1,058) (1,575) (2,189) (3,168)
Total lease expense 12,316 $ 11,999 25,340 24,371
Supplemental Cash Flow Information Related to Leases [Abstract]        
Operating cash outflow from operating leases     25,955 26,570
Right-of-use assets obtained in exchange for lease liabilities     31,178 $ 140,585
Maturities of Operating Lease Liabilities [Abstract]        
2020 27,085   27,085  
2021 46,780   46,780  
2022 30,950   30,950  
2023 21,409   21,409  
2024 16,604   16,604  
Thereafter 27,835   27,835  
Total 170,663   170,663  
Less: Finance charges 26,054   26,054  
Total principal liability 144,609   144,609  
Additional lease liabilities not yet commenced $ 28,200   $ 28,200  
Minimum [Member]        
Leases [Abstract]        
Remaining lease terms     1 year  
Maximum [Member]        
Leases [Abstract]        
Remaining lease terms     24 years  
Extension period for leases     20 years  
Termination period for leases     1 year