Stockholders' Equity, Stock Option (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Options [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Unrecognized compensation cost related to stock options	$ 3,000,000
Nonvested awards, unrecognized cost, period for recognition	1 year 10 months 24 days
Stock Options [Member] | Equity Performance Incentive Plan 2010 [Member]
Stock option activity [Roll Forward]
Outstanding options, beginning balance (in shares)	10,789,590	9,586,364	10,679,057
Granted (in shares)	875,150	3,293,550	1,471,900
Exercised (in shares)	(1,375,431)	(190,480)	(1,681,591)
Forfeited (in shares)	(759,712)	(1,899,844)	(883,002)
Outstanding options, ending balance (in shares)	9,529,597	10,789,590	9,586,364	10,679,057
Options vested and expected to vest (in shares)	9,478,467
Exercisable options (in shares)	7,026,352
Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding, weighted average exercise price, beginning balance (in dollars per share)	$ 2.99	$ 2.83	$ 2.70
Granted in period, weighted average exercise price (in dollars per share)	$ 3.09	$ 3.69	$ 3.53
Exercised in period, weighted average exercise price (in dollars per share)	$ 2.44	$ 2.36	$ 2.70
Forfeited in period, weighted average exercise price (in dollars per share)	$ 3.39	$ 3.40	$ 2.67
Options outstanding, weighted average exercise price, ending balance (in dollars per share)	$ 3.05	$ 2.99	$ 2.83	$ 2.70
Vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 3.05
Exercisable, weighted average exercise price (in dollars per share)	$ 2.93
Additional Disclosures [Abstract]
Average Remaining Contractual Term	3 years 7 months 17 days	4 years 3 months	4 years 5 months 23 days	5 years 29 days
Vested and expected to vest, Average Remaining Contractual Term	3 years 7 months 10 days
Options exercisable, Average Remaining Contractual Term	2 years 11 months 16 days
Options outstanding, Aggregate Intrinsic Value	12,595,000	8,000	35,074,000	2,559,000
Vested and expected to vest, Aggregate Intrinsic Value	12,549,000
Options exercisable, Aggregate Intrinsic Value	9,693,000
Options exercised in period, total intrinsic value	2,400,000	608,000	5,000,000
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Fair value of options vested	$ 2,800,000	$ 1,100,000	$ 3,000,000
Non Vested Shares [Member] | Equity Performance Incentive Plan 2010 [Member]
Stock option activity [Roll Forward]
Outstanding options, beginning balance (in shares)	5,217,111
Granted (in shares)	875,150
Vested (in shares)	(2,829,304)
Forfeited (in shares)	(759,712)
Outstanding options, ending balance (in shares)	2,503,245
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested at beginning of period (in dollars per share)	$ 1.26
Granted (in dollars per share)	$ 1.30
Vested (in dollars per share)	$ 0.99
Forfeited (in dollars per share)	$ 1.50
Nonvested at end of period (in dollars per share)	$ 1.51