Employee Benefit Plans Amounts Recognized on Balance Sheet Table (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	$ 790	$ 980
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Current liabilities	(320)	(410)
Noncurrent liabilities	(11,590)	(7,020)
Net liability recognized at December 31	(11,120)	(6,450)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	0	0
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Current liabilities	(70)	(90)
Noncurrent liabilities	(590)	(720)
Net liability recognized at December 31	$ (660)	$ (810)