Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income or Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014		Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					$ (65,094)		$ (11,450)
Other comprehensive income (loss) before reclassifications					(21,496)		(25,536)
Amounts reclassified from accumulated other comprehensive income (loss)					901		605
Other comprehensive income (loss)	$ (1,810)		$ (23,584)		(20,595)		(24,931)
Ending balance	(85,689)		(36,381)		(85,689)		(36,381)
AOCI, Pension and other postretirement benefit plans, tax	11,502		2,688		11,502		2,688		$ 11,952	$ 2,900
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax	21		61		21		61		$ 50	$ 110
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					(14,193)		22,756
Other comprehensive income (loss) before reclassifications					(21,317)		(25,421)
Amounts reclassified from accumulated other comprehensive income (loss)					0		0
Other comprehensive income (loss)					(21,317)		(25,421)
Ending balance	(35,510)		(2,665)		(35,510)		(2,665)
Funded status of pension plans and other postretirement benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					(50,808)	[1]	(33,997)	[2]
Other comprehensive income (loss) before reclassifications					0	[1]	0	[2]
Amounts reclassified from accumulated other comprehensive income (loss)					808	[1]	395	[2]
Other comprehensive income (loss)					808	[1]	395	[2]
Ending balance	(50,000)	[1]	(33,602)	[2]	(50,000)	[1]	(33,602)	[2]
Unrealized gain (loss) on derivative instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					(93)	[3]	(209)	[4]
Other comprehensive income (loss) before reclassifications					(179)	[3]	(115)	[4]
Amounts reclassified from accumulated other comprehensive income (loss)					93	[3]	210	[4]
Other comprehensive income (loss)					(86)	[3]	95	[4]
Ending balance	$ (179)	[3]	$ (114)	[4]	$ (179)	[3]	$ (114)	[4]

[1] Net of taxes of $11,502 and $11,952 as of September 30, 2015 and December 31, 2014, respectively.

[2] Net of taxes of $2,688 and $2,900 as of September 30, 2014 and December 31, 2013, respectively.

[3] Net of taxes of $21 and $50 as of September 30, 2015 and December 31, 2014, respectively.

[4] Net of taxes of $61 and $110 as of September 30, 2014 and December 31, 2013, respectively.