Pension Benefit and Retirement Health and Life Insurance Benefits (Amounts Recognized in Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	$ 2,982	$ 0
Pension Benefits [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	2,983	0
Current liabilities	(654)	(362)
Noncurrent liabilities	(5,436)	(65,942)
Net amount recognized at end of year	(3,107)	(66,304)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net actuarial loss	35,119
Prior service cost	0
Net amount recognized at end of year	35,119
Retirement Health and Life Insurance Benefits [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	0	0
Current liabilities	(1,175)	(1,237)
Noncurrent liabilities	(9,649)	(10,654)
Net amount recognized at end of year	(10,824)	(11,891)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net actuarial loss	1,778
Prior service cost	0
Net amount recognized at end of year	$ 1,778