Financial Covenants (Details)	12 Months Ended
	Dec. 31, 2012
Debt Disclosure [Abstract]
Interest coverage ratio (not less than):	5.00x	[1]
Leverage ratio (not greater than):	2.75x	[2]

[1] The interest coverage ratio is defined as EBITDA, as defined in the Credit Agreement, to net interest expense plus cash dividends on convertible preferred stock for the four quarters then ended.

[2] The leverage ratio is defined as debt as of the last day of such fiscal quarter to EBITDA, as defined in the Credit Agreement, for the four quarters then ended.