Share-Based Compensation and Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Expected annual dividend rate (as a percent)			1.08%
Risk-free interest rate (as a percent)			1.53%
Average expected life (years)			5 years 8 months 12 days
Expected volatility of common stock (as a percent)			0.401%
Forfeiture rate (as a percent)			0.00%
Weighted average fair value of option grants			$ 5.22
Stock based compensation expense	$ 1.9	$ 1.1	$ 5.8	$ 4.0
Common stock repurchased (in shares)			0	1,250,000
Common stock repurchased, value				$ 18.7
Employee Stock Option | Long Term Incentive Plan 2010
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Options granted (in shares)			206,021
Restricted Stock Units (RSUs)
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Granted (in dollars per share)			$ 14.85
Restricted Stock Units (RSUs) | Long Term Incentive Plan 2010
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Granted (in shares)			380,453
Vesting period			3 years
Performance Share Units | Long Term Incentive Plan 2010
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Granted (in shares)			183,416
Vesting period			3 years
Director | Restricted Stock Units (RSUs)
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Granted (in shares)			42,624