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Lease Commitments
12 Months Ended
Dec. 31, 2015
Leases, Operating [Abstract]  
Lease Commitments
Lease Commitments

We lease certain office and storage facilities, rail cars and other equipment under long-term operating leases, most of which contain renewal options. At December 31, 2015, the minimum future rental commitments under operating leases having non-cancellable lease terms in excess of one year are as follows:
 
 
(In thousands)
2016
 
$
70,512

2017
 
65,807

2018
 
62,364

2019
 
58,664

2020
 
57,047

Thereafter
 
221,589

Total
 
$
535,983



Rental expense charged to operations was $107.3 million, $89.8 million and $72.6 million for the years ended December 31, 2015, 2014 and 2013, respectively. For the years ended December 31, 2015, 2014 and 2013, rental expense included $8.9 million, $8.0 million and $8.3 million, respectively, in costs attributable to the HEP operations.