Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Of Assets Measured On A Recurring And Nonrecurring Basis

			Assets at Fair Value Using
	Total		Quoted Prices  in Activated Markets for Identical Assets (Level 1)		Significant  Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
March 31, 2012
Recurring items
Cash and cash equivalents	$	107,798	$	107,798	$	0	$	0
Convertible Senior Notes	$	272,800	$	272,800	$	0	$	0
Secured Senior Notes	$	731,350	$	731,350	$	0	$	0
Nonrecurring items
Assets held for sale	$	675	$	0	$	0	$	675
December 31, 2011
Recurring items
Cash and cash equivalents	$	94,410	$	94,410	$	0	$	0
Convertible Senior Notes	$	248,000	$	248,000	$	0	$	0
Secured Senior Notes	$	702,700	$	702,700	$	0	$	0
Nonrecurring items
Assets held for sale	$	675	$	0	$	0	$	675