Employee Stock and Incentive Plans - Stock-Based Compensation (Details)	12 Months Ended
	Dec. 31, 2011 Years		Dec. 31, 2010		Dec. 31, 2009		Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants under Director Plan	0	[1]	0	[1]	0	[1]
Options Outstanding	460,234		560,887		646,235		672,419
PSA Performance Period	3
RSU Vesting Period	3
ESPP Discount	5.00%
Long-Term Incentive Compensation, Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants under Director Plan	0
Options Outstanding	1,293
Long-Term Incentive Compensation, Executive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock Reserved	1,300,000
Shares Available for Issuance	600,000

[1] (a)Stock options have not been granted since 2008. The weighted-average grant-date intrinsic value of options granted in 2008 was $6.18.