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Lease Commitments
12 Months Ended
Dec. 31, 2011
Leases [Abstract]  
Leases of Lessee Disclosure
Lease Commitments
The Company incurred $8,817, $8,481, and $7,221 of rental expense under operating leases for the years ended December 31, 2011, 2010 and 2009, respectively. Certain leases contain rent escalation clauses and lease concessions that require additional rental payments in the later years of the term. Rent expense for these types of leases is recognized on a straight-line basis over the minimum lease term. In addition, the Company has the right, but no obligation, to renew certain leases for various renewal terms.





The following table summarizes the future minimum lease payments for non-cancelable operating leases for the next five years and thereafter as of December 31, 2011:
 
 
2012
$
6,841

2013
6,256

2014
4,835

2015
3,619

2016
2,537

Thereafter
10,933

 
$
35,021