Retirement Plan (Net Periodic Pension Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, before Tax				$ 28,986
Other Comprehensive Income Pension Plan Termination	0		0	30,893	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	8,600	30,900			7,102
Defined Benefit Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefit earned during the period	0		0	0	679
Interest cost on projected benefit obligations	0		955	1,797	3,007
Expected return on plan assets	0		(950)	(92)	(2,849)
Amortization of prior service cost	0		0	0	67
Amortization of net loss	0		415	1,386	1,518
Estimated effect of curtailment	0		0	0	899
Net periodic pension expense	0		420	33,984	3,321
Other Post-Retirement Healthcare and Other Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefit earned during the period	278		475	834	1,425
Interest cost on projected benefit obligations	159		875	477	2,625
Amortization of prior service cost	(1,474)		(550)	(4,422)	(1,650)
Amortization of net loss	31		75	93	225
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, before Tax	0		0	1,726	0
Net periodic pension expense	$ (1,006)		$ 875	$ (1,292)	$ 2,625