Borrowings (Tables)

3 Months Ended

Mar. 31, 2012

Principal Repayments

	March 31,
	2012
Principal repayments for the following years
2012	$	43,215
2013		327,912
2014		0
2015		0
2016 and beyond		950,643
Total	$	1,321,770

Convertible Senior Notes Due 2013 [Member]

Total Obligations Under Senior Notes

	March 31,			December 31,
	2012			2011
Convertible Senior Notes	$	310,000		$	310,000
Unamortized debt discount		(851	)		(1,070	)
Debt discount related to ASC 470-20		(3,172	)		(4,285	)
Total	$	305,977		$	304,645

Senior Secured Notes Due 2016 [Member]

Principal Repayments

	March 31,			December 31,
	2012			2011
Senior Secured Notes due 2016	$	953,705		$	935,296
Unamortized debt discount		(3,062	)		(3,207	)
Total	$	950,643		$	932,089