Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Series A Preferred Stock [Member]	Mar. 31, 2013 Common Class A [Member]	Mar. 31, 2013 Common Class B [Member]
Preferred Stock [Abstract]
Preferred stock, shares issued (in shares)	30,407	30,407
Preferred stock, liquidation value (in dollars per share)	$ 1,000	$ 1,000
Number of shares to be purchased by warrant (in shares)				1,104,370
Aggregate purchase price			$ 30.4
Preferred stock cumulative dividend rate percentage for first five years (in hundredths)			5.00%
Preferred stock cumulative dividend rate percentage for thereafter five years (in hundredths)			9.00%
Number of years for warrant issued to treasury			10 years
Warrants, exercise price (in dollars per share)			$ 4.13
Common Stock [Abstract]
Rate class B shares may be converted to class A shares				1.15 to 1	1.15 to 1
Number of vote for class of shares held				1	10
Payments of Dividends [Abstract]
Value on which quarterly dividend is suspended			30.4
Preferred stock dividend in arrears			$ 6.3