Equity and Stock-Based Compensation (Other Stockholder Investment Information Textual) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Repurchase of common stock	3,570,082	3,570,082
Aggregate price of repurchase stock	$ 86,840	$ 86,840
Percentage of average market price used to determine number of shares directors receive in lieu of cash fees (percent)	95.00%
Shares of stock in lieu of cash for director fees	46,711	30,005	35,040
Percentage of restrictions on ownership of company common and preferred stock (percentage)	3.90%
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock shares outstanding (shares)	2,993,090	2,993,090
Preferred stock dividend rate (percentage)	7.75%	7.75%
Liquidation preference per share (dollars per share)	$ 25	$ 25
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock shares outstanding (shares)	3,791,000	3,791,000
Preferred stock dividend rate (percentage)	7.50%	7.50%
Liquidation preference per share (dollars per share)	$ 25	$ 25