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Leases and Other - Net Rent Expense Under Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net rent expense under operating leases      
Minimum rentals $ 59,767 $ 56,575 $ 48,465
Sublease rentals (2,837) (1,525) (2,831)
Total rentals, net $ 56,930 $ 55,050 $ 45,634