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Leases
12 Months Ended
Dec. 31, 2015
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 $47 million, $55 million and $67 million in 2015, 2014 and 2013, respectively. Future minimum lease payments under non-cancelable operating leases at December 31, 2015 were as follows:
Years ending December 31,
 
2016
$
39,782

2017
31,178

2018
26,087

2019
21,874

2020
14,916

Thereafter
67,782

Total minimum lease payments
$
201,619