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Operating Lease Agreements
12 Months Ended
Dec. 31, 2011
Operating Lease Agreements [Abstract]  
Operating Lease Agreements
10.  OPERATING LEASE AGREEMENTS

The future minimum rental commitments, exclusive of cost escalation clauses, at December 31, 2011, for all of the Company's operating leases with remaining non-cancelable terms in excess of one year are as follows:
 
(Dollars in thousands)
     
2012
  $ 11,914  
2013
    11,624  
2014
    9,973  
2015
    9,962  
2016
    9,954  
Thereafter
    33,986  
Net commitments
  $ 87,413  


All of these leases, the expiration terms of which range from 2013 to 2020, are for the rental of office space.  Rental expense was $14,148 thousand, $13,124 thousand and $11,815 thousand for the years ended December 31, 2011, 2010 and 2009, respectively.