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Convertible Senior Notes(Tables)
12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Schedule of Convertible Senior Notes
The following table summarizes the terms of the 2019 Notes.
 
Principal Amount
Coupon Rate
Effective Rate (1)
Conversion Rate (2)
Maturity Date
Remaining Period of Amortization
March 2019 Notes
$
143,750

5.50
%
6.25
%
55.3649

3/15/2019
4.21 years
August 2019 Notes
$
111,000

5.50
%
6.50
%
55.3649

3/15/2019
4.21 years