Shareholders' Equity - Treasury Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	23 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	May 02, 2012
Equity [Abstract]
Number of shares authorized to be repurchased			5,000,000
Stock Repurchased During Period, Shares		1,800,000
Payments for Repurchase of Common Stock		$ 9.0
Remaining number of shares authorized to be repurchased	3,200,000	3,200,000
Average price per share of treasury stock acquired and held	$ 24.35
Movement in Treasury Stock [Roll Forward]
Balance as of December 31, 2013 (shares)	1,121,926
Purchases (shares)	0
Exercise of stock options (shares)	(42,032)
Restricted stock grants, forfeitures and other (shares)	74,338
401(k) matching contribution (shares)	(204,373)
Balance as of March 31, 2014 (shares)	949,859	949,859