Stock Plans (Narrative) (Details) (USD $)	12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2013 ShareBasedCompensationPlan	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2013 Chair of Audit Committee [Member]	Dec. 31, 2012 Chair of Audit Committee [Member]	Dec. 31, 2013 Deferred Fee Plan [Member]	Dec. 31, 2013 EIP Plans [Member]	Dec. 31, 2013 Performance Shares [Member]	Dec. 31, 2012 Performance Shares [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 Non-Employee Director [Member] entity	Dec. 31, 2012 Non-Employee Director [Member]	Dec. 31, 2011 Non-Employee Director [Member]	Dec. 31, 2013 Non-Employee Director [Member] Chair of Retirement Plan Committee [Member]	Dec. 31, 2012 Non-Employee Director [Member] Chair of Retirement Plan Committee [Member]	Dec. 31, 2013 Non-Employee Director [Member] Chair of Nominating and Corporate Governance Committee [Member]	Dec. 31, 2012 Non-Employee Director [Member] Chair of Nominating and Corporate Governance Committee [Member]	Dec. 31, 2013 Non-Employee Director [Member] Chair of Compensation Committee [Member]	Dec. 31, 2012 Non-Employee Director [Member] Chair of Compensation Committee [Member]	Dec. 31, 2013 Non-Employee Director [Member] Lead Director [Member]	Dec. 31, 2012 Non-Employee Director [Member] Lead Director [Member]	Dec. 31, 2013 Non-Employee Director [Member]	Dec. 31, 2012 Non-Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plan under which grants were made	6
Number of stock-based compensation plan under which grants were not made	4
Shares authorized for grant under the plans (in shares)	22,540,761						540,761	20,000,000	1,123,966					2,540,761
Shares available for grant under the plan (in shares)	18,432,664							17,384,055						1,048,609
Expense recognized during the period									$ 1,100,000	$ 400,000	$ 14,900,000	$ 15,900,000	$ 14,800,000	$ 2,100,000	$ 800,000	$ (600,000)
Performance Shares
Initial period over which target number of performance shares are awarded									90 days
Measurement period									3 years
Number of shares granted (in shares)										930,020
Restricted Stock
Remaining unrecognized compensation cost associated with unvested restricted stock awards											19,500,000
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years)											1 year 6 months
Stock Options
Exercisable at end of period (in shares)	83,000	895,000	540,000											116,630
Exercisable at end of period (in dollars per share)	$ 13.23	$ 9.94	$ 10.99	$ 10.50										$ 11.95
Cash received upon exercise of options during the period		100,000
Unrecognized compensation cost associated with unvested stock options	0
Non Employee Directors Compensation Plans
Annual retainer for non employee directors in cash																									90,000	75,000
Annual retainer for non employee directors cash value of stock units																									90,000	75,000
Annual stipend					25,000	20,000											10,000	7,500	15,000	10,000	20,000	20,000	25,000	20,000
Plan units earned during the period (in shares)														374,383	306,634	197,600
Number of directors participating in the plan during the period														11
Cash compensation														$ 700,000	$ 700,000	$ 700,000