Stock Based Compensation (Parenthetical)	0 Months Ended	9 Months Ended
	Oct. 15, 1996	Oct. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stockholders Rights Condition Description	Each of the Rights entitles a stockholder to purchase for an exercise price of $50.00 ($20.70, as adjusted for stock splits and stock dividends), subject to adjustment, one one-hundredth of a share of Series A Junior Participating Cumulative Preferred Stock of the Company, or under certain circumstances, shares of common stock of the Company or a successor company with a market value equal to two times the exercise price.
Maximum term of stock options		10 years
Two Thousand Eleven Stock Incentive Plan [Member] | Restricted Stock Issued Six Nineteen Two Thousand Twelve Vesting One Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of stock options		1 year
Two Thousand Eleven Stock Incentive Plan [Member] | Restricted Stock Issued Six Nineteen Two Thousand Twelve Vesting Five Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of stock options		5 years
Two Thousand Seven Stock Incentive Plan [Member] | Restricted Stock Issued Six Nineteen Two Thousand Twelve Vesting One Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of stock options		1 year
Two Thousand Seven Stock Incentive Plan [Member] | Restricted Stock Issued On Two Thousand Eleven Six Twenty One Vesting Over One Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of stock options		1 year
Two Thousand Seven Stock Incentive Plan [Member] | Restricted Stock Issued On Two Thousand Ten Six Eight Vesting Over One Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of stock options		1 year
Two Thousand Seven Stock Incentive Plan [Member] | Restricted Stock Issued On Two Thousand Nine Six Sixteen Vesting Over Five Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of stock options		5 years
Two Thousand Seven Stock Incentive Plan [Member] | Restricted Stock Issued On Two Thousand Seven Six Nineteen Vesting Over Five Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of stock options		5 years