Stockholders' Equity AOCI Change (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015		Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	$ 0		$ 0		$ 0		$ 0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	456	[1]	670	[1]	1,368	[2]	3,529	[2]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	456		670		1,368		3,529
Accumulated Other Comprehensive Loss, Pension and Other Postretirement Benefit Plans, Net of Tax	(15,817)		(23,593)		(15,817)		(23,593)		$ (16,273)	$ (17,185)	$ (24,263)	$ (27,122)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	2,967		(2,941)		(497)		(7,633)
Other Comprehensive Income (loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Net of Tax	0	[1]	0	[1]	0	[2]	0	[2]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	2,967		(2,941)		(497)		(7,633)
Accumulated Other Comprehensive Loss, Foreign Currency Translation Adjustment, Net of Tax	(17,133)		(17,627)		(17,133)		(17,627)		$ (20,100)	$ (16,636)	$ (14,686)	$ (9,994)
Beginning Balance	(36,373)		(38,949)		(33,821)		(37,116)
Other comprehensive (loss) income before reclassifications	2,967		(2,941)		(497)		(7,633)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	456	[1]	670	[1]	1,368	[2]	3,529	[2]
Net current period other comprehensive income (loss)	3,423		(2,271)		871		(4,104)
Ending Balance	(32,950)		$ (41,220)		(32,950)		$ (41,220)
AOCI Attributable to Parent [Member]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	456				1,368
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ 2,967				$ (497)

[1] (a) See reclassifications from accumulated other comprehensive loss table for details of reclassification from accumulated other comprehensive loss for the three month periods ended September 30, 2016 and 2015.

[2] See reclassifications from accumulated other comprehensive loss table for details of reclassification from accumulated other comprehensive loss for the nine month periods ended September 30, 2016 and 2015.