Share-Based Payments - Stock Incentive Awards (Details) (USD $)	0 Months Ended
	Apr. 08, 2013
Restricted Stock | Nonemployee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/Units Granted	16,000
Grant-Date Fair Value per Award	$ 31.03
Vesting Percentage	25.00%
Vesting Date	April 8, 2017
Restricted Stock | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/Units Granted	17,000
Grant-Date Fair Value per Award	$ 31.03
Vesting Percentage	25.00%
Vesting Date	April 8, 2017
Stock Performance Awards | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/Units Granted	50,200
Grant-Date Fair Value per Award	$ 37.51
Vesting Date	December 31, 2015
Restricted Stock Units (Rsus) | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/Units Granted	15,150
Grant-Date Fair Value per Award	$ 25.30
Vesting Percentage	100.00%
Vesting Date	April 8, 2017