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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Convertible Series AA Preferred Stock [Member]
    
Stockholders' equity:    
Preferred stock, par or stated value (in dollars per share) $ 0.01 $ 0.01
Preferred stock liquidation preference value (in dollars per share) $ 25 $ 25
Preferred stock shares authorized (in shares) 1,000,000 1,000,000
Preferred stock shares issued (in shares) 0 0
Preferred stock shares outstanding (in shares) 0 0
Redeemable Convertible Series 6.3% Preferred Stock [Member]
    
Stockholders' equity:    
Preferred stock, par or stated value (in dollars per share) $ 0.01 $ 0.01
Preferred stock liquidation preference value (in dollars per share) $ 1,000 $ 1,000
Preferred stock shares authorized (in shares) 10,000 10,000
Preferred stock shares issued (in shares) 1,649 1,649
Preferred stock shares outstanding (in shares) 1,649 1,649
Preferred stock dividend rate percentage (in hundredths) 6.30% 6.30%
Common Class A [Member]
    
Stockholders' equity:    
Common stock, par or stated value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock shares issued (in shares) 16,576,401 16,473,674
Common stock shares outstanding (in shares) 16,576,401 16,473,674