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Cash Equivalents
9 Months Ended
Sep. 30, 2013
Cash Equivalents [Abstract]  
Cash Equivalents
(4)Cash Equivalents

At September 30, 2013 and December 31, 2012, the company had invested approximately $230 million and $215 million, respectively, in cash equivalents in the form of money market funds with three financial institutions.  The company considers these money market funds to be Level 1 financial instruments.