Royalty Monetization (Tables)

12 Months Ended

Dec. 31, 2012

Royalty Monetization [Abstract]

Schedule of redemption percentage of notes

	Redemption
Payment Dates (Between Indicated Dates)	Percentage
From and including March 9, 2012 to and including March 8, 2013		107.0	%
From and including March 9, 2013 to and including March 8, 2014		103.5	%
From and including March 9, 2014 and thereafter		100.0	%