Preferred Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Series D Preferred Stock, outstanding (in shares)	55,000	65,000
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Redemption of preferred stock	$ 1,000	$ 500
Dividends paid for Series D Preferred Stock	468	482
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Series D Preferred Stock, outstanding (in shares)	55,000	65,000
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)	1,378,000
Maximum number of common stock issuable from conversion of preference shares, without obtaining prior shareholder approval (in shares)	2,703,000
Company redeemed shares (in shares)	10,000	5,000
Redemption of preferred stock	1,000	500
Dividends accrued but unpaid	18	21
Dividends paid for Series D Preferred Stock	$ 471	$ 483