Benefit Plans (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011
Stock options outstanding
Stock Options Exercisable, Aggregate Intrinsic Value	$ 1,999
Restricted Stock Options vested and expected-to-vest, Weighted Average Exercise Price	$ 0.00
Stock Options [Member]
Stock options outstanding
Stock Options vested and expected-to-vest, Number of shares	9,194
Stock Options vested and expected-to-vest, Weighted Average Exercise Price	$ 7.11
Stock Options vested and expected-to-vest, Weighted Average Remaining Contractual Term	3.5
Stock Options vested and expected-to-vest, Aggregate Intrinsic Value	3,108
Stock Options Exercisable, Number of shares	7,034
Stock Options Exercisable, Weighted Average Exercise Price	$ 7.25
Stock Options Exercisable, Weighted Average Remaining Contractual Term	2.8
Stock Options Exercisable, Aggregate Intrinsic Value	1,999
Restricted Stock [Member]
Stock options outstanding
Stock Options vested and expected-to-vest, Number of shares	3,488
Restricted Stock Options vested and expected-to-vest, Weighted Average Remaining Contractual Term	1.2
Restricted Stock Options vested and expected-to-vest, Aggregate Fair Value	$ 17,584