Employee Benefits Plans (Details Textual) (USD $)	12 Months Ended				12 Months Ended					12 Months Ended
	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2012 Pension Benefits [Member]	Dec. 31, 2011 Pension Benefits [Member]	Dec. 31, 2010 Pension Benefits [Member]	Dec. 31, 2012 Rabbi Trusts [Member]	Dec. 31, 2011 Rabbi Trusts [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Age	Dec. 31, 2010 2010 Canadian pension plan settlement [Member]	Dec. 31, 2012 Non-qualified supplemental pension plan [Member]	Dec. 31, 2011 Non-qualified supplemental pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
MEP Contribution Percent		17.00%
Accrued pension liability	$ 600,584,000			$ 549,801,000								$ 46,000,000	$ 42,000,000
Pre-tax settlement loss											2,000,000
Prior service credit to be recognized					2,000,000
Net actuarial loss to be recognized					35,603,000
U.S. pension plan assets percentage of total pension plan assets	75.00%
Required pension contributions to our pension plans			66,000,000
Expense related to defined contribution savings plans					33,000,000	33,000,000	27,000,000
Liability related to the cash awards	26,548,000			22,690,000	27,000,000	23,000,000
Assets held in trust								26,000,000	23,000,000
Value of common stock issued in trust								$ 4,000,000	$ 4,000,000
Maximum age limit of qualified retirees for health care benefits										65
Assumed change in healthcare cost trend rates in each year										1.00%