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Leases
12 Months Ended
Dec. 31, 2011
Leases [Abstract]  
Leases
11. 
Leases

We lease various office facilities, furniture, 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 $14.0 million, $14.0 million and $14.1 million in 2011, 2010 and 2009, respectively.  At December 31, 2011, future minimum rental payments under noncancelable operating leases are as follows:
 
   
Operating
Leases
 
   
(in thousands)
 
     
2012
 $13,488 
2013
  11,681 
2014
  8,327 
2015
  5,078 
2016
  3,659 
Thereafter
  1,884 
Total minimum lease payments
 $44,117