Preferred Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Class of Stock [Line Items]
Series D Preferred Stock, outstanding (in shares)	70,000	70,000
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Dividends paid for Series D Preferred Stock	$ 508	$ 508
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Series D Preferred Stock, outstanding (in shares)	70,000	70,000
Preferred stock, par value (in dollars per share)	$ 100	$ 100
Accrued annual dividends rate (in dollars per share)	$ 7.25	$ 7.25
Number of preferred stock shares convertible to common shares (in shares)	1,754,000	1,754,000
Maximum number of common stock issuable from conversion of preference shares, without obtaining prior shareholder approval (in shares)	2,703,000
Dividends accrued but unpaid	23	530
Dividends paid for Series D Preferred Stock	1,015
Preferred stock dividends in arrears paid	$ 508