Preferred stock shares (Details) (USD $)	Dec. 31, 2012	Sep. 30, 2011	Nov. 01, 2006	Sep. 30, 2006
TCI issued C series shares				30,000
Series C Cumulative Convertible Preferred Stock				30,000
Liquidation preference per share.				$ 100
Dividends are payable at the annual rate per share				$ 7.00
Dividends are payable at the quarterly per share				$ 1.75
Preferred stock converted in common stock				90.00%
Series C Preferred Stock issued and outstanding shares	30,000
TCI issued shares of Series D Preferred Stock			100,000
Liquidation price per share			$ 100.00
Dividends payable at the initial rate			$ 7.0
Increase in dividends payable interest rate			9.00%
Redemption request on original preferred stock issuance		1,300,000