Stock-Based Compensation (Details 2) (2012 Amended Executive Officer Non-Qualified Stock Option Agreement, USD $)	12 Months Ended
	Dec. 31, 2013
$14.13 to $18.05
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)	$ 18.05
OPTIONS OUTSTANDING
NUMBER OUTSTANDING (in shares)	678,133
WEIGHTED-AVERAGE REMAINING LIFE	1 year 9 months 18 days
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 16.02
OPTIONS EXERCISABLE
NUMBER EXERCISABLE (in shares)	454,803
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 15.75
$18.22 to $23.27
Stock options outstanding and exercisable
Exercise Price Range, Lower Range Limit (in dollars per share)	$ 18.22
Exercise Price Range, Upper Range Limit (in dollars per share)	$ 23.27
OPTIONS OUTSTANDING
NUMBER OUTSTANDING (in shares)	1,053,994
WEIGHTED-AVERAGE REMAINING LIFE	3 years 6 months
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 20.36
OPTIONS EXERCISABLE
NUMBER EXERCISABLE (in shares)	615,349
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 21.89
$30.60 to $72.13
Stock options outstanding and exercisable
Exercise Price Range, Lower Range Limit (in dollars per share)	$ 30.60
Exercise Price Range, Upper Range Limit (in dollars per share)	$ 72.13
OPTIONS OUTSTANDING
NUMBER OUTSTANDING (in shares)	594,074
WEIGHTED-AVERAGE REMAINING LIFE	1 year
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 51.39
OPTIONS EXERCISABLE
NUMBER EXERCISABLE (in shares)	580,741
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 51.87