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Fair Value Measurement - Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Cash Equivalents, at Carrying Value [Abstract]        
Cash equivalents $ 50,148 $ 89,336 $ 113,220  
Cash 117,026 139,785 99,243  
Total cash and cash equivalents $ 167,174 $ 229,121 $ 212,463 $ 321,990