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Leases

12 Months Ended

Dec. 31, 2014

Leases

We lease our corporate office facilities in San Antonio, Texas at a payment escalating from $41,264 per month in January 2015 to $50,246 per month in December 2020. We recognize rent expense on a straight-line basis for our corporate office lease. We also lease real estate at 51 other locations, which are primarily used for field offices and storage and maintenance yards, and we lease vehicles, office and other equipment under non-cancelable operating leases, most of which contain renewal options and some of which contain escalation clauses.

Future lease obligations required under non-cancelable operating leases as of December 31, 2014 were as follows (amounts in thousands):



Year ended December 31,
2015	$	4,441
2016	3,282
2017	2,709
2018	1,705
2019	1,288
Thereafter	1,509
	$	14,934

Rent expense under operating leases for the years ended December 31, 2014, 2013 and 2012 was $5.9 million, $6.0 million and $5.6 million, respectively.

- Definition

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

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