Share-Based Compensation - Summary of Information on Stock Options Outstanding and Exercisable (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Range One
Summary of information concerning stock options outstanding and exercisable
Range of Exercise Prices, upper limit	$ 17.62
Options Outstanding, Shares	262,788
Options Outstanding, Weighted-Average Remaining Contractual Life	5 years 8 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 17.62
Options Exercisable, Shares	262,788
Options Exercisable, Weighted-Average Exercise Price	$ 17.62
Range Two
Summary of information concerning stock options outstanding and exercisable
Range of Exercise Prices, upper limit	$ 22.85
Options Outstanding, Shares	10,895
Options Outstanding, Weighted-Average Remaining Contractual Life	1 year 10 months 24 days
Options Outstanding, Weighted-Average Exercise Price	$ 22.85
Options Exercisable, Shares	10,895
Options Exercisable, Weighted-Average Exercise Price	$ 22.85
Range Three
Summary of information concerning stock options outstanding and exercisable
Range of Exercise Prices, upper limit	$ 31.03
Options Outstanding, Shares	22,118
Options Outstanding, Weighted-Average Remaining Contractual Life	1 year 2 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 31.03
Options Exercisable, Shares	22,118
Options Exercisable, Weighted-Average Exercise Price	$ 31.03
Range Four
Summary of information concerning stock options outstanding and exercisable
Range of Exercise Prices, upper limit	$ 35.28
Options Outstanding, Shares	18,522
Options Outstanding, Weighted-Average Remaining Contractual Life	1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 35.28
Options Exercisable, Shares	18,522
Options Exercisable, Weighted-Average Exercise Price	$ 35.28
Range Five
Summary of information concerning stock options outstanding and exercisable
Range of Exercise Prices, lower limit	$ 17.62
Range of Exercise Prices, upper limit	$ 35.28
Options Outstanding, Shares	314,323
Options Outstanding, Weighted-Average Remaining Contractual Life	5 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 19.79
Options Exercisable, Shares	314,323
Options Exercisable, Weighted-Average Exercise Price	$ 19.79