7. Stockholders' Equity Treasury Shares (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Treasury Class-A [Member]	Dec. 31, 2012 Treasury Class-A [Member]	Dec. 31, 2013 Treasury Class B [Member]	Dec. 31, 2012 Treasury Class B [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares		122	122	917	917
Stock Repurchase Program, Authorized Amount	$ 18.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 3.3