Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income or Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		$ (65,094)		$ (11,450)
Other comprehensive income before reclassifications		(27,174)		(37,042)
Actuarial net gain (loss) incurred in fiscal year		2,760		(20,715)		$ 32,749
Amounts reclassified from accumulated other comprehensive income		1,050		4,113
Net current-period other comprehensive income		(23,364)		(53,644)
Ending Balance		(88,458)		(65,094)		(11,450)
AOCI, Pension and other postretirement benefit plans, tax		9,879		11,952		2,900
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax		5		50		110
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		(14,193)		22,756
Other comprehensive income before reclassifications		(27,172)		(36,949)
Actuarial net gain (loss) incurred in fiscal year		0		0
Amounts reclassified from accumulated other comprehensive income		0		0
Net current-period other comprehensive income		(27,172)		(36,949)
Ending Balance		(41,365)		(14,193)		22,756
Funded status of pension plans and other postretirement benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	[1]	(50,808)	[2]	(33,997)
Other comprehensive income before reclassifications		0	[2]	0	[1]
Actuarial net gain (loss) incurred in fiscal year		2,760	[2]	(20,715)	[1]
Amounts reclassified from accumulated other comprehensive income		966	[2]	3,904	[1]
Net current-period other comprehensive income		3,726	[2]	(16,811)	[1]
Ending Balance		(47,082)	[2]	(50,808)	[1],[2]	(33,997)	[1]
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	[4]	(93)	[3]	(209)
Other comprehensive income before reclassifications		(2)	[3]	(93)	[4]
Actuarial net gain (loss) incurred in fiscal year		0	[3]	0	[4]
Amounts reclassified from accumulated other comprehensive income		84	[3]	209	[4]
Net current-period other comprehensive income		82	[3]	116	[4]
Ending Balance		$ (11)	[3]	$ (93)	[3],[4]	$ (209)	[4]

[1] Net of taxes of $11,952 and $2,900 for the periods ended December 31, 2014 and December 31, 2013, respectively.

[2] Net of taxes of $9,879 and $11,952 for the periods ended December 31, 2015 and December 31, 2014, respectively.

[3] Net of taxes of $5 and $50 for the periods ended December 31, 2015 and December 31, 2014, respectively.

[4] Net of taxes of $50 and $110 for the periods ended December 31, 2014 and December 31, 2013, respectively.