Borrowings (Tables)

6 Months Ended

Jun. 30, 2011

Principal Repayments

	June 30,
	2011
Principal repayments for the following years
2011	$	26,238
2012		60,729
2013		302,055
2014		0
2015 and beyond		999,887
Total	$	1,388,909

Convertible Senior Notes due 2013 [Member]

Total Obligations Under Debt Arrangement

	June 30,			December 31,
	2011			2010
Convertible Senior Notes	$	310,000		$	310,000
Unamortized debt discount		(1,507	)		(2,311	)
Debt discount related to ASC 470-20		(6,438	)		(8,567	)
Total	$	302,055		$	299,122

Senior Secured Notes due 2016 [Member]

Total Obligations Under Debt Arrangement

	June 30,			December 31,
	2011			2010
Senior Secured Notes due 2016	$	1,003,372			955,296
Unamortized debt discount		(3,485	)		(3,660	)
Total	$	999,887		$	951,636