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Operating Lease Agreements
12 Months Ended
Dec. 31, 2013
Operating Lease Agreements [Abstract]  
Operating Lease Agreements
10.  OPERATING LEASE AGREEMENTS

The future minimum rental commitments, exclusive of cost escalation clauses, at December 31, 2013, for all of the Company's operating leases with remaining non-cancelable terms in excess of one year are as follows:

(Dollars in thousands)
     
2014
  $ 10,227  
2015
    10,994  
2016
    11,089  
2017
    10,436  
2018
    10,522  
Thereafter
    26,336  
Net commitments
  $ 79,604  

All of these leases, the expiration terms of which range from 2016 to 2024, are for the rental of office space.  Rental expense was $12,405 thousand, $12,232 thousand and $12,656 thousand for the years ended December 31, 2013, 2012 and 2011, respectively.