Stockholders' Equity (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares outstanding (in shares)	0	0
Treasury stock (in shares)	1,738,624	1,757,530
Common stock reserved for issuance (in shares)	640,331
Nonvoting Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	730,746	730,746
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares outstanding (in shares)	0	0
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000	100,000,000