Stockholders' Equity AOCI Change (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Beginning Balance		$ (47,398)	$ (17,610)	$ (45,565)	$ (18,743)
Other comprehensive (loss) income before reclassifications		(2,941)	(2,064)	(7,633)	(1,438)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	670	254	3,529	761
Net current period other comprehensive income (loss)		(2,271)	(1,810)	(4,104)	(677)
Ending Balance		(49,669)	(19,420)	(49,669)	(19,420)
Defined Benefit Pension and Postretirement Items
Accumulated Other Comprehensive Loss, Pension and Other Postretirement Benefit Plans, Net of Tax		(32,042)	(13,365)	(32,042)	(13,365)	$ (32,712)	$ (35,571)	$ (13,619)	$ (14,126)
Other comprehensive (loss) income before reclassifications		0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	670	254	3,529	761
Net current period other comprehensive income (loss)		670	254	3,529	761
Foreign Currency Items
Accumulated Other Comprehensive Loss, Foreign Currency Translation Adjustment, Net of Tax		(17,627)	(6,055)	(17,627)	(6,055)	$ (14,686)	$ (9,994)	$ (3,991)	$ (4,617)
Other comprehensive (loss) income before reclassifications		(2,941)	(2,064)	(7,633)	(1,438)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	0	0	0	0
Net current period other comprehensive income (loss)		$ (2,941)	$ (2,064)	$ (7,633)	$ (1,438)

[1] 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, 2015 and 2014, respectively.