Stock-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SSARS Expiration Date	P10Y
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	$ 1.4
Unrecognized compensation costs	4.2
Weighted-average period of years costs are expected to be recognied over	1 year 3 months 18 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	0.2
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	3 years
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Starting Term When Options Become Exercisable After Grant Date	3 months
Director [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of months for options to vest at an incremental rate of ten percent for directors	3 months
Director [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	3.5
Weighted-average period of years costs are expected to be recognied over	1 year 4 months 21 days
Chief Executive Officer [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 0.7
Weighted-average period of years costs are expected to be recognied over	1 year 9 months 29 days