Employee Benefits Plans (Details Textual) (USD $)	12 Months Ended				12 Months Ended					12 Months Ended
	Dec. 31, 2013	Jun. 30, 2012	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013 Pension Benefits [Member]	Dec. 31, 2012 Pension Benefits [Member]	Dec. 31, 2011 Pension Benefits [Member]	Dec. 31, 2013 Rabbi Trusts [Member]	Dec. 31, 2012 Rabbi Trusts [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Age	Dec. 31, 2013 Non-qualified supplemental pension plan [Member]	Dec. 31, 2012 Non-qualified supplemental pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
MEP Contribution Percent		5.00%
Accrued pension liability	$ 295,815,000			$ 600,584,000							$ 44,000,000	$ 46,000,000
Prior service credit to be recognized					2,000,000
Net actuarial loss to be recognized					24,958,000
U.S. pension plan assets percentage of total pension plan assets	75.00%
Required pension contributions to our pension plans			75,000,000
Expense related to defined contribution savings plans					35,000,000	33,000,000	33,000,000
Liability related to the cash awards	34,401,000			26,548,000	34,000,000	27,000,000
Assets held in trust								35,000,000	26,000,000
Value of common stock issued in trust								$ 2,000,000	$ 2,000,000
Maximum age limit of qualified retirees for health care benefits										65
Assumed change in healthcare cost trend rates in each year										1.00%