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Retirement and Other Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Retirement and Other Benefit Plans [Abstract]      
Number of defined contribution plans maintained by the company 11    
Defined contribution retirement plan cost $ 16,500 $ 16,400 $ 15,200