Stockholders' Equity (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Preferred Stock [Abstract]
Preferred stock, authorized (in shares)	1,500,000	1,500,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock issued, Rights Agreement (in shares)	0	0
Rights Agreement [Abstract]
Portion of Series A shares to be purchased for each common stock outstanding	0.007
Purchase price of right (in dollars per unit)	$ 56
Minimum percentage of beneficial ownership required to acquire to exercise right (in hundredths)	15.00%
Minimum percentage of tender or exchange offer required to announce to exercise right (in hundredths)	15.00%
Expiration date of Rights Agreement	Oct. 28, 2018
Increase in purchase price per unit to exercise right (in dollars per unit)	$ 200.00
Minimum assets or earning power divested in order to trigger contingent condition (in hundredths)	50.00%
Description of contingent condition in the Rights Agreement	each holder shall thereafter have the right to receive, upon exercise of each right, that number of shares of common stock of the acquiring company that, at the time of such transaction, would have a market value of two times the $56 purchase price.
Series A Participating Cumulative Preferred Stock [Member]
Preferred Stock [Abstract]
Preferred stock designated for Rights Agreement (in shares)	100,000
Preferred stock issued, Rights Agreement (in shares)	0