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Leases
12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Leases
Leases
We lease office facilities, sales and service offices, equipment and other properties under operating lease agreements with varying terms. Certain leases require us to pay property taxes, insurance and routine maintenance and include renewal options and escalation clauses. Rent expense was $45 million, $47 million and $55 million in 2016, 2015 and 2014, respectively. Future minimum lease payments under non-cancelable operating leases at December 31, 2016 were as follows:
Years ending December 31,
 
2017
$
45,892

2018
39,953

2019
31,191

2020
20,519

2021
12,670

Thereafter
38,720

Total minimum lease payments
$
188,945