Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014 Pension Plans, Defined Benefit [Member]	Dec. 31, 2012 Qualified Salaried Pension Plan [Member]	Dec. 31, 2012 Qualified Non-Represented Pension Plan [Member]	Dec. 31, 2012 Qualified Hourly Pension Plan [Member]	Dec. 31, 2013 Trend rate grading ratably to an assumption in 2083 [Member]	Dec. 31, 2012 Discretionary Funding [Member]	Dec. 31, 2014 Scenario, Forecast [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
401(K) contributions by employer	$ 1,800,000	$ 1,600,000	$ 1,400,000
Pension Contributions	0	21,630,000	9,400,000
Contributions					9,300,000	5,500,000	6,800,000		11,900,000
Accumulated benefit obligation	387,400,000	438,600,000
Estimated net loss to be amortized from Accumulated Other Comprehensive Loss ino Net Periodic Benefit Cost				14,500,000						2,700,000
Estimated prior service cost to be amortized from Accumulated Other Comprehensive Loss ino Net Periodic Benefit Cost				700,000						9,600,000
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	1,700,000
Non-Qualified Pension Plan, Estimated Payments in Next Fiscal Year	$ 1,800,000
Health care cost trend rate assumed for next fiscal year	7.70%							5.00%