Stock-Based Compensation (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013
$11.45 to $20.21
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	613,978
Options Outstanding, Average Remaining Life (Years)	4 years 0 months 4 days
Options Outstanding, Average Exercise Price	$ 16.60
Options Exercisable, Number of Shares	592,454
Options Exercisable, Average Exercise Price	$ 16.61
Range of Exercise Prices, Lower Range Limit	$ 11.45
Range of Exercise Prices, Upper Range Limit	$ 20.21
$20.69 to $22.34
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	472,189
Options Outstanding, Average Remaining Life (Years)	4 years 6 months 15 days
Options Outstanding, Average Exercise Price	$ 21.42
Options Exercisable, Number of Shares	374,070
Options Exercisable, Average Exercise Price	$ 21.61
Range of Exercise Prices, Lower Range Limit	$ 20.69
Range of Exercise Prices, Upper Range Limit	$ 22.34
$23.18 to $26.59
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	423,674
Options Outstanding, Average Remaining Life (Years)	5 years 6 months 22 days
Options Outstanding, Average Exercise Price	$ 25.48
Options Exercisable, Number of Shares	191,646
Options Exercisable, Average Exercise Price	$ 25.88
Range of Exercise Prices, Lower Range Limit	$ 23.18
Range of Exercise Prices, Upper Range Limit	$ 26.59
$32.76 to $33.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	6,500
Options Outstanding, Average Remaining Life (Years)	3 years 7 months 17 days
Options Outstanding, Average Exercise Price	$ 32.97
Options Exercisable, Number of Shares	6,500
Options Exercisable, Average Exercise Price	$ 32.97
Range of Exercise Prices, Lower Range Limit	$ 32.76
Range of Exercise Prices, Upper Range Limit	$ 33.45