Stock-Based Compensation and Retirement Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Apr. 04, 2012	Dec. 31, 2011
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Employee deferral to non qualified deferred compensation plan	up to 75% of their base salary, up to 100% of their bonus, and up to 100% of the cash portion of their PSU compensation to the plan
Proceed from issue of shares under employee stock purchase plans	$ 819,000	$ 634,000
Stock Options [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Option vested, Period	Over 3 years
Option expires, years	In 10 years
Compensation expense	1,800,000	800,000
Restricted Stock [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Option vested, Period	Over 3 years
Compensation expense	5,700,000	1,400,000
Restricted Stock Units [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Option vested, Period	Within 30 days
Compensation expense	800,000	300,000
Performance Share Units [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Compensation expense	2,000,000	1,100,000
Performance period of PSU grant, years	3 year
Performance measures for participants	PSUs will settle in cash or a combination of cash and up to 50% of equivalent value in the Company’s common stock, at the discretion of the compensation committee.
Portion of equivalent value in common stock of company after meeting service requirements, at discretion of compensation committee	50.00%
Current liability	7,200,000			3,800,000
Long-term liability	4,300,000			6,800,000
Issue of common stock to employees	43,259
Amount paid to employees for settlement			2,700,000
Employee Stock Purchase Plan [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Compensation expense	100,000	100,000
Common stock reserved for issuance	1,250,000
Proceed from issue of shares under employee stock purchase plans	800,000	600,000
Shares issued under Employee Stock Purchase Plan, shares	34,000	20,000
Deferred Compensation [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Maximum portion of base salary to defer under non-qualified deferred compensation plan	75.00%
Maximum portion of bonus to defer under non-qualified deferred compensation plan	100.00%
Maximum of cash portion of PSU compensation to defer under non-qualified deferred compensation plan	100.00%
Non employee deferral to non-qualified deferred compensation plan	Defer up to 100% of their cash compensation paid by the Company to the plan. Additionally, participating directors may defer up to 100% of the shares of common stock
Non-employee cash deferred to non-qualified compensation plan	100.00%
Non-employee RSU deferred to non-qualified compensation plan	100.00%
Supplemental Executive Retirement Plan [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Compensation expense	$ 1,200,000	$ 400,000