Stockholders' Equity AOCI Change (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive (Loss) Income, Pension and Other Postretirement Benefit Plans, Net of Tax	$ (9,797)	$ (17,185)	$ (27,122)
Accumulated Other Comprehensive (Loss) Income, foreign currency translation	(16,142)	(16,636)	(9,994)
Total accumulated other comprehensive (loss) income	(25,939)	(33,821)	(37,116)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	5,565	(966)
Other Comprehensive Income Foreign currency translation	494	(6,642)
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax	6,059	(7,608)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	(1,823)	(10,903)
Other Comprehensive Income (loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Net of Tax	0	0
Reclassification from Accumulated Other Comprehensive (Loss) Income, Current Period, Net of Tax	(1,823)	(10,903)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(7,388)	(9,937)	12,996
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	494	(6,642)	(5,377)
Other comprehensive income (loss)	7,882	3,295	(18,373)
AOCI Attributable to Parent [Member]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(7,388)	(9,937)	12,996
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ 494	$ (6,642)	$ (5,377)