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Leases
12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Leases
13.
Leases

We lease various office facilities, equipment and vehicles under operating lease arrangements, some of which contain rent escalation clauses.  Most of the leases contain purchase and/or renewal options at fair market and fair rental value, respectively.  Rental expense relating to all operating leases was $13.4 million, $13.9 million and $13.8 million in 2014, 2013 and 2012, respectively.  At December 31, 2014, future minimum rental payments under noncancelable operating leases are as follows:

 
 
Operating
Leases
 
 
(in thousands)
2015
 
$
13,364

2016
 
11,821

2017
 
8,534

2018
 
6,822

2019
 
4,189

Thereafter
 
5,312

Total minimum lease payments
 
$
50,042