Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Fair value assumptions of stock options
Dividend yield	2.00%	2.00%
Risk-free interest rate	1.20%	2.27%
Expected volatility	49.11%	47.24%
Weighted average expected life	6 years	6 years
Weighted average per share fair value of stock options	$ 5.05	$ 5.56
Summary of Company's Stock Option Activities
Stock Options Shares Outstanding, Beginning balance	7,055,274	7,301,458
Granted, Shares	3,025,269	1,624,369
Exercised, Shares	(11,120)	(23,437)
Forfeited or expired, Shares	(1,156,987)	(1,847,116)
Stock Options Shares Outstanding, Ending balance	8,912,436	7,055,274
Options exercisable, shares	4,818,426	4,623,935
Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance	$ 21.99	$ 24.33
Granted, Weighted Average Exercise Price	$ 12.98	$ 14.20
Exercised, Weighted Average Exercise Price	$ 13.16	$ 12.66
Forfeited or expired, Weighted Average Exercise Price	$ 21.04	$ 24.51
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance	$ 19.06	$ 21.99
Options Exercisable, Weighted Average Exercise Price	$ 23.98	$ 26.10
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 5 months	5 years 7 months
Options exercisable, Weighted Average Remaining Contractual Term	4 years 5 months	4 years
Stock Options Outstanding, Aggregate Intrinsic Value	$ 817	$ 27
Options exercisable, Aggregate Intrinsic Value	$ 56	$ 7