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Lease Comitments
12 Months Ended
Dec. 31, 2017
Lease Commitments [Abstract]  
Lease Commitments [Table Text Block]
Lease Commitments

The company leases certain office, distribution, and other property under non-cancelable operating leases expiring at various dates through 2033. Rental expense under non-cancelable operating leases, net of sublease income, amounted to $83,636, $78,521, and $77,405 in 2017, 2016, and 2015, respectively.

Aggregate minimum rental commitments under all non-cancelable operating leases, exclusive of real estate taxes, insurance, and leases related to facilities closed as a result of the integration of acquired businesses and the restructuring of the company, are as follows:
2018
 
$
75,058

2019
 
64,397

2020
 
49,616

2021
 
37,157

2022
 
27,964

Thereafter
 
135,079