Employee Benefit Plans Amounts Recognized on Balance Sheet Table (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Prepaid benefit cost	$ 980	$ 1,020
Current liabilities	(410)	(410)
Noncurrent liabilities	(7,020)	(11,480)
Net liability recognized at December 31	(6,450)	(10,870)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Prepaid benefit cost	0	0
Current liabilities	(90)	(90)
Noncurrent liabilities	(720)	(880)
Net liability recognized at December 31	$ (810)	$ (970)