Convertible Senior Notes Due 2017 (Interest Expense Recorded And Expected To Be Recorded In Consolidated Statement Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Interest Expense [Line Items]
Actual interest expense, Interest at Coupon Rate of 2.625%	$ 226
Amortization of discount and deferred financing costs on Convertible Notes	357
Actual interest expense, Non-Cash Amortization of Debt Issuance Costs	2
Actual interest expense, Total Interest Expense	585
Expected interest expense, Interest at Coupon Rate of 2.625%	33,961
Expected interest expense, Non-Cash Amortization of Debt Discount	71,298
Expected interest expense, Non-Cash Amortization of Debt Issuance Costs	5,964
Expected interest expense, Total	111,223
Remainder Of 2012 [Member]
Interest Expense [Line Items]
Expected interest expense, Interest at Coupon Rate of 2.625%	5,094
Expected interest expense, Non-Cash Amortization of Debt Discount	8,557
Expected interest expense, Non-Cash Amortization of Debt Issuance Costs	740
Expected interest expense, Total	14,391
2013 [Member]
Interest Expense [Line Items]
Expected interest expense, Interest at Coupon Rate of 2.625%	6,792
Expected interest expense, Non-Cash Amortization of Debt Discount	12,409
Expected interest expense, Non-Cash Amortization of Debt Issuance Costs	1,033
Expected interest expense, Total	20,234
2014 [Member]
Interest Expense [Line Items]
Expected interest expense, Interest at Coupon Rate of 2.625%	6,792
Expected interest expense, Non-Cash Amortization of Debt Discount	13,737
Expected interest expense, Non-Cash Amortization of Debt Issuance Costs	1,144
Expected interest expense, Total	21,673
2015 [Member]
Interest Expense [Line Items]
Expected interest expense, Interest at Coupon Rate of 2.625%	6,792
Expected interest expense, Non-Cash Amortization of Debt Discount	15,207
Expected interest expense, Non-Cash Amortization of Debt Issuance Costs	1,266
Expected interest expense, Total	23,265
2016 [Member]
Interest Expense [Line Items]
Expected interest expense, Interest at Coupon Rate of 2.625%	6,792
Expected interest expense, Non-Cash Amortization of Debt Discount	16,901
Expected interest expense, Non-Cash Amortization of Debt Issuance Costs	1,407
Expected interest expense, Total	25,100
2017 [Member]
Interest Expense [Line Items]
Expected interest expense, Interest at Coupon Rate of 2.625%	1,699
Expected interest expense, Non-Cash Amortization of Debt Discount	4,487
Expected interest expense, Non-Cash Amortization of Debt Issuance Costs	374
Expected interest expense, Total	$ 6,560