Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income or Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014		Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					$ (65,094)		$ (11,450)
Other comprehensive income before reclassifications					(19,410)		(1,897)
Amounts reclassified from accumulated other comprehensive income					625		472
Other comprehensive income (loss)	$ 8,709		$ (1,267)		(18,785)		(1,425)
Ending balance	(83,879)		(12,875)		(83,879)		(12,875)
AOCI, Pension and other postretirement benefit plans, tax	11,657		2,759		11,657		2,759		$ 11,952	$ 2,900
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax	33		90		33		90		$ 50	$ 110
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					(14,193)		22,756
Other comprehensive income before reclassifications					(19,250)		(1,730)
Amounts reclassified from accumulated other comprehensive income					0		0
Other comprehensive income (loss)					(19,250)		(1,730)
Ending balance	(33,443)		21,026		(33,443)		21,026
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 before reclassifications					0	[1]	0	[2]
Amounts reclassified from accumulated other comprehensive income					531	[1]	263	[2]
Other comprehensive income (loss)					531	[1]	263	[2]
Ending balance	(50,277)	[1]	(33,734)	[2]	(50,277)	[1]	(33,734)	[2]
Unrealized gain (loss) on derivative instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					(93)	[3]	(209)	[4]
Other comprehensive income before reclassifications					(160)	[3]	(167)	[4]
Amounts reclassified from accumulated other comprehensive income					94	[3]	209	[4]
Other comprehensive income (loss)					(66)	[3]	42	[4]
Ending balance	$ (159)	[3]	$ (167)	[4]	$ (159)	[3]	$ (167)	[4]

[1] Net of taxes of $11,657 and $11,952 as of June 30, 2015 and December 31, 2014, respectively.

[2] Net of taxes of $2,759 and $2,900 as of June 30, 2014 and December 31, 2013, respectively.

[3] Net of taxes of $33 and $50 as of June 30, 2015 and December 31, 2014, respectively.

[4] Net of taxes of $90 and $110 as of June 30, 2014 and December 31, 2013, respectively.