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Leases
12 Months Ended
Dec. 31, 2014
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 $55 million, $67 million and $68 million in 2014, 2013 and 2012, respectively. Future minimum lease payments under non-cancelable operating leases at December 31, 2014 were as follows:
Years ending December 31,
 
2015
$
47,496

2016
35,864

2017
26,306

2018
19,899

2019
14,313

Thereafter
67,726

Total minimum lease payments
$
211,604