Employee Benefit Plans Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Pension Benefits [Member]	Dec. 31, 2012 Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2011 Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2012 Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]	Dec. 31, 2011 Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]	Dec. 31, 2010 Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]	Dec. 31, 2012 Equity Securities [Member]	Dec. 31, 2012 Fixed Income Securities [Member]	Dec. 31, 2012 Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Amendments					$ 2,183,000
Defined Benefit Plan, Effect of Plan Amendment on Accumulated Benefit Obligation						(55,542,000)
Health care cost trend rate assumed		7.50%
Accumulated benefit obligation of pension plans		366,100,000	314,700,000
Benefit obligation for the unfunded pension plan		10,600,000
Accumulated benefit obligation for the unfunded pension plan		9,400,000
Amortization of net prior service cost				200,000	11,000,000
Defined Benefit Plan, Amortization of Net Gains (Losses)		900,000		16,200,000	306,000
Ultimate trend rate		4.50%
Effect of one-percentage-point increase in health care cost trend rate		1,000,000
Effect of one-percentage-point decrease in health care cost trend rate		800,000
Defined Benefit Plan, Target Plan Asset Allocations										65.00%	30.00%	5.00%
Pension Contributions	900,000
Other postretirement benefits payments							$ 27,200,000	$ 25,900,000	$ 18,100,000