Stockholders' Equity AOCI Reclassification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service cost	$ (200)	$ (244)
Actuarial Loss	(1,623)	(3,821)
Pension Curtailment, Recognized Prior Service Cost	0	(2,923)
Pension Settlement, Recognized Prior Service Cost	0	(3,915)
Reclassification from Accumulated Other Comprehensive (Loss) Income, Current Period, before Tax	(1,823)	(10,903)
Other Comprehensive (Loss) Income, Tax, Portion Attributable to Parent	0	0
Reclassification from Accumulated Other Comprehensive (Loss) Income, Current Period, Net of Tax	$ (1,823)	$ (10,903)