Stock-Based Compensation (Details 2) (Stock options, USD $)	12 Months Ended
	Dec. 31, 2011 Y
$14.13 to $16.68
Stock options outstanding and exercisable
Exercise Price Range, Lower Range Limit (in dollars per share)	$ 14.13
Exercise Price Range, Upper Range Limit (in dollars per share)	$ 16.68
OPTIONS OUTSTANDING
NUMBER OUTSTANDING (in shares)	1,203,000
WEIGHTED-AVERAGE REMAINING LIFE (in years)	3.4
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 15.86
OPTIONS EXERCISABLE
NUMBER EXCERCISABLE (in shares)	311,345
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 14.83
$20.99 to $37.37
Stock options outstanding and exercisable
Exercise Price Range, Lower Range Limit (in dollars per share)	$ 20.99
Exercise Price Range, Upper Range Limit (in dollars per share)	$ 37.37
OPTIONS OUTSTANDING
NUMBER OUTSTANDING (in shares)	1,609,638
WEIGHTED-AVERAGE REMAINING LIFE (in years)	2.0
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 25.14
OPTIONS EXERCISABLE
NUMBER EXCERCISABLE (in shares)	1,126,665
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 25.93
$40.00 to $72.13
Stock options outstanding and exercisable
Exercise Price Range, Lower Range Limit (in dollars per share)	$ 40.00
Exercise Price Range, Upper Range Limit (in dollars per share)	$ 72.13
OPTIONS OUTSTANDING
NUMBER OUTSTANDING (in shares)	1,136,236
WEIGHTED-AVERAGE REMAINING LIFE (in years)	1.9
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 48.06
OPTIONS EXERCISABLE
NUMBER EXCERCISABLE (in shares)	1,136,236
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 48.06