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Cash Equivalents
6 Months Ended
Jun. 30, 2014
Cash Equivalents [Abstract]  
Cash Equivalents
(5)Cash Equivalents

At June 30, 2014 and December 31, 2013, the company had invested approximately $335 million and $260 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.