Stock-Based Compensation (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009
Weighted-average inputs used and fair values determined for stock options granted
Weighted-average grant-date fair value (in dollars per share)	$ 6.02	$ 9.05	$ 5.01
Share-based compensation arrangement by share-based payment award, nonvested options
Nonvested options at the beginning of the period (in shares)	1,142,130	883,398	935,327
Granted (in shares)	781,000	846,000	482,000
Vested (in shares)	(498,507)	(425,107)	(410,180)
Forfeited (in shares)	(49,995)	(162,161)	(123,749)
Nonvested options at the end of the period (in shares)	1,374,628	1,142,130	883,398
Nonvested stock options weighted average grant date fair value
Nonvested options at the beginning of the period, weighted-average grant-date fair value (in dollars per share)	$ 8.31	$ 8.23	$ 12.19
Weighted-average grant-date fair value (in dollars per share)	$ 6.02	$ 9.05	$ 5.01
Vested (in dollars per share)	$ 8.37	$ 9.44	$ 13.10
Forfeited (in dollars per share)	$ 7.89	$ 8.79	$ 9.50
Nonvested options at the end of the period, weighted-average grant-date fair value (in dollars per share)	$ 7.00	$ 8.31	$ 8.23
Information related to nonvested options
Total unrecognized compensation cost related to nonvested stock option awards	$ 5.2
Total unrecognized compensation cost, period of recognition (in years)	2.2
Restricted stock units
Restricted stock units
Restricted stock units at the beginning of the period (in shares)	727,317	609,812	480,002
Shares awarded (in shares)	305,000	404,000	416,482
Shares vested (in shares)	(314,492)	(235,496)	(206,672)
Shares forfeited (in shares)	(60,000)	(50,999)	(80,000)
Restricted stock units at the end of the period (in shares)	657,825	727,317	609,812
Outstanding restricted shares vesting schedule
Outstanding restricted stock unit awards, vesting in 2012 (in shares)	338,827
Outstanding restricted stock unit awards, vesting in 2013 (in shares)	217,331
Outstanding restricted stock unit awards, vesting in 2014 (in shares)	101,667
Stock options
Weighted-average inputs used and fair values determined for stock options granted
Assumed annual dividend rate upon which expected dividend yield is based (in dollars per share)	$ 0.12	$ 0.12	$ 0.12
Expected volatility (as a percent)	51.00%	53.60%	49.00%
Expected dividend yield (as a percent)	0.70%	0.50%	0.90%
Expected term (in years)	3.5	3.5	3.5
Risk-free rate (as a percent)	1.40%	1.60%	1.70%
Weighted-average grant-date fair value (in dollars per share)	$ 6.02	$ 9.05	$ 5.01
Share-based compensation arrangement by share-based payment award, nonvested options
Granted (in shares)	781,000	846,000	482,000
Nonvested stock options weighted average grant date fair value
Weighted-average grant-date fair value (in dollars per share)	$ 6.02	$ 9.05	$ 5.01