Stock Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
All Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of stock-based compensation plan	5
Number of stock-based compensation plans under which no further awards may be granted (the EIP)	3
Shares authorized for grant under the plans (in shares)	12,540,761
Shares available for grant under two plans (in shares)	3,274,997
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	930,020
Restricted Stock [Member]
Number of Shares [Roll Forward]
Balance at beginning of period (in shares)	4,847,000
Restricted stock granted (in shares)	3,667,000
Restricted stock vested (in shares)	(1,131,000)
Restricted stock forfeited (in shares)	(13,000)
Balance at end of period (in shares)	7,370,000
Weighted Average Grant Date Fair Value [Abstract]
Balance at beginning of period (in dollars per shares)	$ 8.40
Restricted stock granted (in dollars per shares)	$ 4.22	$ 9.40
Restricted stock vested (in dollars per shares)	$ 9.04
Restricted stock forfeited (in dollars per shares)	$ 7.64
Balance at end of period (in dollars per shares)	$ 6.23
Aggregate Fair Value [Abstract]
Balance at beginning of period	$ 24,962,000
Restricted stock granted	15,291,000	13,800,000
Restricted stock vested	4,716,000	7,500,000
Balance at end of period	30,732,000	42,400,000
Remaining unrecognized compensation cost associated with unvested restricted stock awards	37,300,000
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years)	2
Stock Options [Member]
Shares Subject to Option [Roll forward]
Balance at beginning of period (in shares)	895,000
Options granted (in shares)	0	0
Options exercised (in shares)	0
Options canceled, forfeited or lapsed (in shares)	0
Balance at end of period (in shares)	895,000
Exercisable at end of period (in shares)	895,000
Weighted Average Option Price Per Share [Abstract]
Balance at beginning of period (in dollars share)	$ 9.94
Options granted (in dollars per share)	$ 0
Options exercised (in dollars per share)	$ 0
Options canceled, forfeited or lapsed (in dollars per share)	$ 0
Balance at end of period (in dollars per share)	$ 9.94
Exercisable at end of period (in dollars per share)	$ 9.94
Weighted Average Remaining Life in Years [Abstract]
Balance at beginning of period (in years)	1.3
Balance at end of period (in years)	1.1
Exercisable at end of period (in years)	1.1
Aggregate Intrinsic Value [Abstract]
Balance at beginning of period	0
Options exercised	0
Balance at end of period	0	11,000
Exercisable at end of period	0
Cash received upon exercise of options during the period		$ 100,000