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Fair Value Measurement - Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Cash Equivalents, at Carrying Value [Abstract]        
Cash equivalents $ 49,770 $ 89,336 $ 165,844  
Cash 156,010 139,785 94,929  
Total cash and cash equivalents $ 205,780 $ 229,121 $ 260,773 $ 321,990