Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share
Net loss	$ (247,096)	$ (196,143)	$ (241,638)	$ (186,594)
Shares of common stock and common stock equivalents:
Average common shares used in basic computation	38,607	41,112	38,859	41,272
Average common shares used in diluted computation	38,607	41,112	38,859	41,272
Loss per share:
Basic (in dollars per share)	$ (6.40)	$ (4.77)	$ (6.22)	$ (4.52)
Diluted (in dollars per share)	$ (6.40)	$ (4.77)	$ (6.22)	$ (4.52)
Anti-dilutive equity awards not included in the detailed earnings per share computation
Equity awards not included in the detailed earnings per share computation	1,541	1,849	1,602	1,438