Borrowings (Tables)

12 Months Ended

Dec. 31, 2011

Line of Credit Facility [Line Items]

Principal Repayments

	December 31, 2011
2012	$	78,504
2013		304,645
2014		0
2015		0
2016 and beyond		932,764
Total	$	1,315,913

Convertible Senior Notes Due 2013 [Member]

Line of Credit Facility [Line Items]

Total Obligations Under Senior Notes

	December 31,			December 31,
	2011			2010
Convertible Senior Notes	$	310,000		$	310,000
Unamortized debt discount		(1,070	)		(2,311	)
Debt discount		(4,285	)		(8,567	)
Total	$	304,645		$	299,122

Senior Secured Notes Due 2016 [Member]

Line of Credit Facility [Line Items]

Total Obligations Under Senior Notes

	December 31,			December 31,
	2011			2010
Senior Secured Notes due 2016	$	935,971			955,296
Unamortized debt discount		(3,207	)		(3,660	)
Total	$	932,764		$	951,636