Employee Benefit Plans (Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plans
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial (gain) loss experienced during the year	$ (14,138)	$ 28,748	$ 14,312
Net actuarial loss recognized as expense	(8,934)	(4,908)	(3,755)
Prior service cost recognized as expense	(311)	(340)	(298)
Total recognized in other comprehensive income (loss)	(23,383)	23,500	10,259
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Amortization of prior service cost	314
Amortization of net actuarial loss	5,422
Postretirement Benefit Plans
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial (gain) loss experienced during the year	(8,057)	(1,787)	2,111
Net actuarial loss recognized as expense	550	0	0
Transition obligation recognized as expense	(283)	(294)	(286)
Total recognized in other comprehensive income (loss)	(7,790)	(2,081)	1,825
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Amortization of net actuarial loss	(593)
Amortization of net transition obligation	$ 42