Common Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Common stock, shares authorized	1,200,000
Common Class A
Class of Stock [Line Items]
Common stock, shares authorized	600,000	600,000
Common stock, par or stated value per share	$ 1.00	$ 1.00
Common stock, shares, issued	195,502
Common stock, voting rights	1
Common Class B
Class of Stock [Line Items]
Common stock, shares authorized	600,000
Common stock, par or stated value per share	$ 1.00
Common stock, voting rights	10