Senior notes (Tables)

6 Months Ended

Jun. 30, 2013

Percentage of Principal Amount Accrued and Unpaid Interest

At any time and from time to time on or after May 1, 2014, the Company may redeem the Notes, in whole or in part, at a redemption price equal to the percentage of principal amount set forth below plus accrued and unpaid interest to the redemption date:

12-Month period commencing	Percentage
On or after May 1, 2014		104.5	%
On or after May 1, 2015 and thereafter		100.0	%