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Investments in Marketable Securities (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Marketable Securities [Abstract]          
Investments in marketable securities $ 158,100,000   $ 158,100,000   $ 157,900,000
Gain (loss) on available-for-sale securities $ 1,800,000 $ 0 $ 1,800,000 $ 2,100,000