Stock, Stock Options and Rights - Option Transactions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Options Outstanding [Roll Forward]
Options outstanding at the beginning of the period (shares)	28,436	30,101	29,851
Options outstanding at the beginning of the period (weighted-average exercise price per share)	$ 6.03	$ 7.96	$ 9.36
Options granted (shares)	5,678	7,521	5,772
Options granted (weighted-average exercise price per share)	$ 11.94	$ 7.37	$ 3
Options exercised (shares)	(2,738)	(6,360)	(2,526)
Options exercised (weighted-average exercise price per share)	$ 6.43	$ 5.50	$ 4.38
Options forfeited (shares)	(1,829)	(2,826)	(2,996)
Options forfeited (weighted-average exercise price per share)	$ 12.51	$ 31.38	$ 15.32
Options outstanding at the end of the period (shares)	29,547	28,436	30,101
Options outstanding at the end of the period (weighted-average exercise price per share)	$ 6.73	$ 6.03	$ 7.96
Options exercisable at the end of period (shares)	15,963	14,208	18,095
Options exercisable at the end of period (weighted-average exercise price)	$ 5.34	$ 6.35	$ 10.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 18,263	$ 27,539	$ 6,992
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	8,499	81,045
Closing Stock Price, Per Share	$ 4.87	$ 11.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 13,519	$ 166,360	$ 35,630