Benefit Plans Benefit Plans - Textuals (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended		3 Months Ended			12 Months Ended								3 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2013	Jul. 31, 2013	Sep. 30, 2013 Pension Plans, Defined Benefit [Member]	Mar. 31, 2013 Pension Plans, Defined Benefit [Member]	Dec. 31, 2012 Pension Plans, Defined Benefit [Member]	Dec. 31, 2014 Pension Plans, Defined Benefit [Member]	Dec. 31, 2013 Pension Plans, Defined Benefit [Member]	Dec. 31, 2012 Pension Plans, Defined Benefit [Member]	Dec. 31, 2011 Pension Plans, Defined Benefit [Member]	Dec. 31, 2014 Other Benefits [Member]	Dec. 31, 2013 Other Benefits [Member]	Dec. 31, 2012 Other Benefits [Member]	Dec. 31, 2011 Other Benefits [Member]	Dec. 31, 2013 Voluntary Early Retirement Program [Member] Pension Plans, Defined Benefit [Member]	Dec. 31, 2013 Defined Benefit Plan Curtailment [Member]	Dec. 31, 2012 Defined Benefit Plan Curtailment [Member]	Dec. 31, 2011 Defined Benefit Plan Curtailment [Member]	Sep. 30, 2013 Defined Benefit Plan Curtailment [Member] Pension Plans, Defined Benefit [Member]	Dec. 31, 2013 Private equity funds [Member] Special Situation Private Equity and Debt Funds [Member]	Dec. 31, 2012 Private equity funds [Member] Special Situation Private Equity and Debt Funds [Member]	Dec. 31, 2013 Private equity funds [Member] Venture Private Equity Funds [Member]	Dec. 31, 2012 Private equity funds [Member] Venture Private Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan Asset Underlying Investment Portfolio Holdings Percentage																			25.00%	25.00%	25.00%	25.00%
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments			$ 809	$ 1,159			$ (10,672)	$ 0	$ 0		$ 0	$ 0	$ 0	$ 8,704
Defined Benefit Plan, Curtailments															(1,272)	0	0	52,462
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		5.06%			4.21%		5.09%	4.21%			5.09%	4.21%
Defined Benefit Plan, Actuarial Gain (Loss)			71,000				72,187	(96,043)			1,991	414
Settlements, plan assets					62,754		138,482	62,754			0	0		138,482
Defined Benefit Plan, reduction to plan assets for anticipated lump sum payments in next fiscal year							15,817							15,817
Pension Expense														67,593
Settlement loss					21,907		(20,156)	(21,907)	0		0	0	0	20,156
Special termination benefits							38,733	0	0		0	0	0	38,733
Defined Benefit Plan, Period of Return for Fixed Income Investments From Discount Rate Assumptions	20 years
Defined Benefit Plan, Contributions by Employer							3,570	15,711			1,494	1,861
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year						$ 4,567				$ 1,695