Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated (Deficit)	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2010	$ 2,040,767	$ 893	$ 2,578,206	$ (538,332)
Beginning Balance, Shares at Dec. 31, 2010		89,316
Net income	82,135			82,135
Unrealized loss on marketable securities, net of tax	(4,176)				(4,176)
Common stock issued/cancelled under long-term incentive plans, net	6,248	4	6,244
Common stock issued/cancelled under long-term incentive plans, net, shares		337
Ending Balance at Sep. 30, 2011	$ 2,124,974	$ 897	$ 2,584,450	$ (456,197)	$ (4,176)
Ending Balance, Shares at Sep. 30, 2011		89,653