Stock Plans (Narrative) (Details) (USD $)	9 Months Ended			3 Months Ended	9 Months Ended			9 Months Ended
	Sep. 30, 2013 ShareBasedCompensationPlan	Sep. 30, 2012	Dec. 31, 2012	Mar. 31, 2012 Performance Shares [Member]	Sep. 30, 2013 Performance Shares [Member]	Sep. 30, 2012 Performance Shares [Member]	Mar. 31, 2013 Performance Shares [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2012 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plan under which grants were made	6
Number of stock-based compensation plan under which grants were not made	4
Shares authorized for grant under the plans (in shares)	22,540,761						1,123,966
Shares available for grant under the plan (in shares)	18,381,480
Initial period over which target number of performance shares are awarded					90 days
Measurement period					3 years
Number of shares granted (in shares)				930,020
Expense recognized during the period					$ 800,000	$ 300,000
Remaining unrecognized compensation cost associated with unvested restricted stock awards								22,800,000
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years)								2 years
Shares granted (in shares)					1,124,000			3,355,000	3,941,000
Restricted stock granted								14,024,000	19,400,000
Restricted stock vested								12,916,000	6,600,000
Fair value of unvested restricted stock								26,340,000	35,300,000	30,169,000
Restricted stock granted (in dollars per shares)								$ 4.10	$ 4.17
Options granted (in shares)		0
Intrinsic value of options outstanding		0
Intrinsic value of exercisable options		$ 0