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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
As of December 31, 2012, minimum future rental payments, exclusive of taxes and other charges, of these leases were: 
Years Ending December 31,
 
(in thousands)
2013
 
$
4,309

2014
 
4,018

2015
 
3,454

2016
 
2,032

2017
 
1,468

Thereafter
 
7,329

Total minimum payments
 
$
22,610