Benefit Plans Amounts Recognized in Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ 43,496	$ 73,425
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	757	737
Noncurrent liabilities	36,584	64,720
Liabilities	37,341	65,457
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	68	60
Noncurrent liabilities	6,913	8,705
Liabilities	$ 6,981	$ 8,765