Stock and Incentive Compensation Plans (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jan. 31, 2013 Restricted stock [Member]	Dec. 31, 2012 Restricted stock [Member]	Dec. 31, 2011 Restricted stock [Member]	Dec. 31, 2010 Restricted stock [Member]	Dec. 31, 2012 EVA Incentive Compensation Plan [Member]	Dec. 31, 2011 EVA Incentive Compensation Plan [Member]	Dec. 31, 2009 EVA Incentive Compensation Plan [Member]	Dec. 31, 2012 2005 Executive Incentive Compensation Plan [Member]	Dec. 31, 2011 2005 Executive Incentive Compensation Plan [Member]	Dec. 31, 2010 2005 Executive Incentive Compensation Plan [Member]	Dec. 31, 2012 2005 Executive Incentive Compensation Plan [Member] Restricted stock units [Member]	Dec. 31, 2012 2005 Non Employee Directors Restricted Stock Plan [Member]	Dec. 31, 2011 2005 Non Employee Directors Restricted Stock Plan [Member]	Dec. 31, 2010 2005 Non Employee Directors Restricted Stock Plan [Member]
Stock and Incentive Compensation Plans (Textual) [Abstract]
Expenses related to plan					$ 0.8	$ 0.5	$ 0.8	$ 1.3	$ 0.4	$ 0.8
Number of common stock expected to be granted											6,125,000				575,000
Options issued				561,680							0	0	0
Restricted stock shares granted											970,250	1,149,750	913,750		78,064	52,500	52,500
Expiration period											10 years				10 years
Vesting period														3 years
Non Stock Based compensation	$ 0.8	$ 0.5	$ 0.8
Stock and Incentive Compensation Plans (Additional Textual) [Abstract]
Shares available under all of the stock compensation plans	2,476,213