Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015		Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance				$ (88,458)
Other comprehensive income (loss) before reclassifications				6,605		$ (21,496)
Amounts reclassified from accumulated other comprehensive income (loss)				116	[1]	901	[2]
Other comprehensive income (loss)		$ 1,442	$ (1,810)	6,721		(20,595)
Ending balance		(81,737)		(81,737)
AOCI, Pension and other postretirement benefit plans, tax		9,821	11,502	9,821		11,502		$ 9,879	$ 11,952
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax		0	21	0		21		$ 5	$ 50
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance				(41,365)		(14,193)
Other comprehensive income (loss) before reclassifications				6,605		(21,317)
Amounts reclassified from accumulated other comprehensive income (loss)				0	[1]	0	[2]
Other comprehensive income (loss)				6,605		(21,317)
Ending balance		(34,760)	(35,510)	(34,760)		(35,510)
Funded status of pension plans and other postretirement benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[3]			(47,082)		(50,808)
Other comprehensive income (loss) before reclassifications	[3]			0		0
Amounts reclassified from accumulated other comprehensive income (loss)	[3]			105	[1]	808	[2]
Other comprehensive income (loss)	[3]			105		808
Ending balance	[3]	(46,977)	(50,000)	(46,977)		(50,000)
Reclassification from AOCI, Current Period, Tax				435		57
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[4]			(11)		(93)
Other comprehensive income (loss) before reclassifications	[4]					(179)
Amounts reclassified from accumulated other comprehensive income (loss)	[4]			11	[1]	93	[2]
Other comprehensive income (loss)	[4]			11		(86)
Ending balance	[4]	0	(179)	0		(179)
Reclassification from AOCI, Current Period, Tax				50		6
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance				(88,458)		(65,094)
Ending balance		$ (81,737)	$ (85,689)	$ (81,737)		$ (85,689)

[1] Net of taxes of $57 and $6 for the pension plans and postretirement benefits and unrealized gain (loss) on derivatives, respectively.

[2] Net of taxes of $435 and $50 for the pension plans and postretirement benefits and unrealized gain (loss) on derivatives, respectively.

[3] Net of taxes of $9,821 and $9,879 as of September 30, 2016 and December 31, 2015, respectively. Net of taxes of $11,502 and $11,952 as of September 30, 2015 and December 31, 2014, respectively.

[4] Net of taxes of $0 and $5 as of September 30, 2016 and December 31, 2015, respectively. Net of taxes of $21 and $50 as of September 30, 2015 and December 31, 2014, respectively.