Share-Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Summary of Company's Share Based Compensation Activities and Other Information [Abstract]
Beginning Balance	$ 42
Beginning Balance, shares	6,391
Granted	$ 54
Granted, shares	1,154
Exercised	$ 40
Exercised, shares	(1,486)
Forfeited	$ 44
Forfeited, shares	(72)
Ending Balance	$ 45
Ending Balance, shares	5,987
Exercisable at end of year	$ 43
Exercisable at end of year, shares	4,118
Shares available for future grants	3,405
Summary of company's nonvested share awards (RSUs) activity
Beginning Balance, Shares	171
Beginning Balance	$ 44
Granted, Shares	126
Granted	$ 54
Vested, Shares	(59)
Vested	$ 49
Forfeited, Shares	(16)
Forfeited	$ 48
Ending Balance, Shares	222
Ending Balance	$ 48