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Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash and Cash Equivalents [Abstract]        
Cash $ 355,951 $ 394,565    
Money Market Funds, at Carrying Value 50 50,055    
Cash and Cash Equivalents, at Carrying Value $ 356,001 $ 444,620 $ 577,528 $ 492,299