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Notes Payable
6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Debt Disclosure [Text Block]
(6)
Notes Payable
 
The Company’s 4% convertible notes matured on June 1, 2013, and the Company repaid in full the outstanding principal amount of $115.8 million, together with accrued interest thereon. As of December 31, 2012, the principal amount of the convertible notes outstanding was $115.8 million.
 
During 2012, the Company retired $13.6 million in principal amount of its then outstanding 4% convertible notes at a price above par and wrote-off approximately $62,000 of deferred debt issuance costs. As of December 31, 2012, the balance of unamortized deferred debt issuance costs was approximately $0.2 million.
 
Accrued interest (included in accrued expenses) on the Company’s 4% convertible notes amounted to $0.4 million as of December 31, 2012.