Stock-Based Compensation (Narrative) (Details) (USD $)			12 Months Ended			11 Months Ended			12 Months Ended	4 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended										3 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2011 Stock Options [Member] years	Dec. 31, 2011 Stock Appreciation Rights [Member] years	Jan. 01, 2011 Stock Appreciation Rights [Member]	Dec. 31, 2011 Restricted Stock Awards [Member]	Jan. 01, 2011 Restricted Stock Awards [Member]	Jan. 02, 2010 Restricted Stock Awards [Member]	Dec. 31, 2011 Restricted Stock Awards [Member] years	Apr. 23, 2011 Deferred Stock [Member]	Dec. 31, 2011 Deferred Stock [Member] years	Jan. 01, 2011 Deferred Stock [Member]	Feb. 28, 2011 Performance-Contingent Restricted Stock [Member]	Dec. 31, 2011 Performance-Contingent Restricted Stock [Member]	Jan. 01, 2011 Performance-Contingent Restricted Stock [Member]	Dec. 31, 2011 TSR Rank Less Than 50th Percentile Of S&P TSR [Member]	Dec. 31, 2011 TSR Rank Less Than 50th Percentile Of S&P TSR [Member] Restricted Stock Awards [Member]	Dec. 31, 2011 TSR Rank Greater Than 50th Percentile Of S&P TSR [Member]	Dec. 31, 2011 Maximum [Member] Stock Appreciation Rights [Member]	Jan. 01, 2011 Maximum [Member] Stock Appreciation Rights [Member]	Dec. 31, 2011 Minimum [Member] Stock Appreciation Rights [Member]	Jan. 01, 2011 Minimum [Member] Stock Appreciation Rights [Member]	Dec. 31, 2011 Non-Employee Directors [Member]	Jul. 16, 2011 Non-Employee Directors [Member] Deferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares that may be issued or transferred under EPIP	27,937,500
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP	$ 3,100,000		$ 5,400,000								$ 600,000
Options outstanding average exercise price			$ 15.67
Weighted average remaining contractual life			4.37
Aggregate intrinsic value			24,500,000
Expected weighted-average period to recognize compensation cost (years)			1.70						1.03		0.62
Approximate vesting period						2/10/2013	2/9/2012	2/9/2011			two	2 years		two	2 years					9 years		1 year
Percentage of return on invested capital														2.50%
Return on investment target over the two fiscal years immediately preceding the vesting date														3.75%
Number of shares issued to plan participants									241,680				377,910
Maximum percentage of change in grant																20.00%
Reduction in grant, percentage																	20.00%
Reduction in grant, common shares																60,240
Percentage of change in grant																1.30%		1.30%
Deferred shares exercised for retainer conversions											32,025
Maximum percentage of award, declared as dividend														100.00%
Total fair value of shares vested									3,400,000		1,300,000
Fair value of rights																			$ 18.14		$ 7.07
Dividend yield				3.00%
Expected volatility				29.00%
Risk-free interest rate				0.83%
Expected life, minimum (years)				0.45
Expected life, maximum (years)				2.20
Percentage of increase in vested awards													20.00%
Increase in vested awards, common shares													62,985
Aggregate shares converted										25,440														50,400
Shares exercised for deferred shares issued				161,000							52,732
Deferred stock vesting period																							one year
Other long-term liabilities	$ 52,567,000	$ 45,291,000		$ 2,300,000	$ 4,200,000