Equity (Details 3) (USD $)	0 Months Ended	12 Months Ended
	Feb. 26, 2010	Dec. 29, 2012	Dec. 31, 2011
Reverse Stock Split
Reverse stock split conversion ratio	0.2
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10	$ 0.10
Amended Rights Plan
Number of common share purchase rights declared as a dividend for each outstanding common share and stock options granted and available for grant		1
Number of shares of common stock that can be purchased upon exercise of rights		1
Common stock purchase price (in dollars per share)		$ 30.00
Minimum percentage of beneficial ownership interest in the Entity's common stock to be acquired by a person or group for the rights to be exercisable		15.00%
Specified amount divided by one-half of the then-current market price of the acquirer's stock, for determining the number of shares after rights becoming exercisable		$ 30.00
Percentage of current market price of the acquirer's stock for determining the number of shares after rights becoming exercisable		15.00%
Specified amount divided by one-half of the current market price of the entity's stock, for determining the number of shares when beneficial ownership interest is acquired		$ 30.00
Percentage of current market price of the entity's stock, for determining number of shares when beneficial ownership is interest acquired		15.00%
Number of common shares per right, considered for determining the exchange ratio		1
Redemption price per right of common share (in dollars per share)		$ 0.001