Stock, Stock Options and Rights - Option Transactions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Options Outstanding [Roll Forward]
Options outstanding at the beginning of the period (shares)	29,547	28,436	30,101
Options outstanding at the beginning of the period (weighted-average exercise price per share)	$ 6.73	$ 6.03	$ 7.96
Options granted (shares)	7,293	5,678	7,521
Options granted (weighted-average exercise price per share)	$ 5.82	$ 11.94	$ 7.37
Options exercised (shares)	(1,189)	(2,738)	(6,360)
Options exercised (weighted-average exercise price per share)	$ 3.30	$ 6.43	$ 5.50
Options forfeited (shares)	(2,410)	(1,829)	(2,826)
Options forfeited (weighted-average exercise price per share)	$ 8.02	$ 12.51	$ 31.38
Options outstanding at the end of the period (shares)	33,241	29,547	28,436
Options outstanding at the end of the period (weighted-average exercise price per share)	$ 6.56	$ 6.73	$ 6.03
Options exercisable at the end of period (shares)	19,156	15,963	14,208
Options exercisable at the end of period (weighted-average exercise price)	$ 5.51	$ 5.34	$ 6.35