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Debt Obligations
6 Months Ended
Jun. 30, 2013
Debt Obligations [Abstract]  
Debt Disclosure [Text Block]
Debt Obligations
On July 25, 2011, the Company issued $60,000 aggregate principal amount of 3.75% Convertible Senior Notes due 2016 (the “Notes”) at par. The Notes were issued pursuant to an indenture, dated as of July 25, 2011, between the Company and Bank of New York Mellon Trust Company, N.A., as Trustee, which includes a form of Note. The Notes provide for the payment of interest semi-annually in arrears on January 15 and July 15 of each year, beginning January 15, 2012, at an annual rate of 3.75% and will mature on July 15, 2016, unless earlier converted or repurchased. The Notes may be converted, under certain circumstances, based on an initial conversion rate of 77.241 shares of Company common stock per $1 principal amount of Notes, which represents an initial conversion price of approximately $12.95 per share. Concurrently with the issuance of the Notes, the Company purchased a convertible note hedge and sold a warrant. Each of the convertible note hedge and warrant transactions were entered into with an affiliate of the initial purchaser of the Notes. The convertible note hedge is intended to reduce the potential future dilution to the Company’s common stock associated with the conversion of the Notes. However, the warrant transaction will have a dilutive effect on the Company’s earnings per share to the extent that the price of the Company’s common stock exceeds the strike price of the warrant. The strike price of the warrant will initially be $17.00 per share. The net proceeds to the Company from the sale of the Notes, including the convertible note hedge and warrant were $50,249.
The following table reflects the net carrying value of the Notes:

June 30, 2013

December 31, 2012
Convertible senior notes
$
60,000


$
60,000

Less: Unamortized interest discount
9,653


10,990

     Net carrying value of convertible senior notes
$
50,347


$
49,010


The following table presents the amount of interest cost recognized relating to the Notes during the three and six months ended June 30, 2013 and June 30, 2012.
 
Three Months Ended
 
Six Months Ended

June 30, 2013
 
June 30, 2012
 
June 30, 2013
 
June 30, 2012
Contractual interest coupon
$
562

 
$
562

 
$
1,124

 
$
1,125

Amortization of interest discount
670

 
608

 
1,337

 
1,213

Amortization of debt issuance costs
73

 
60

 
145

 
119

     Total interest cost recognized
$
1,305

 
$
1,230

 
$
2,606

 
$
2,457


The remaining bond discount of the Notes of $9,653, as of June 30, 2013 will be amortized over the remaining life of the Notes.