Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income or Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (11,450)		$ (57,808)
Other comprehensive income before reclassifications	(507)		(9,407)
Actuarial net gain (loss) incurred in the fiscal year	0
Amounts reclassified from accumulated other comprehensive income	349		1,037
Net current-period other comprehensive income	(158)		(8,370)
Ending balance	(11,608)		(66,178)
AOCI, Pension and other postretirement benefit plans, tax	2,825		21,813		2,900	22,371
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax	96		126		110	127
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	22,756		12,585
Other comprehensive income before reclassifications	(327)		(9,398)
Actuarial net gain (loss) incurred in the fiscal year	0
Amounts reclassified from accumulated other comprehensive income	0		0
Net current-period other comprehensive income	(327)		(9,398)
Ending balance	22,429		3,187
Funded status of pension plans and other postretirement benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(33,997)	[1]	(70,158)	[2]
Other comprehensive income before reclassifications	0	[1]	0	[2]
Actuarial net gain (loss) incurred in the fiscal year	0	[1]
Amounts reclassified from accumulated other comprehensive income	139	[1]	1,037	[2]
Net current-period other comprehensive income	139	[1]	1,037	[2]
Ending balance	(33,858)	[1]	(69,121)	[2]
Unrealized gain (loss) on derivative instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(209)	[3]	(235)	[4]
Other comprehensive income before reclassifications	(180)	[3]	(9)	[4]
Actuarial net gain (loss) incurred in the fiscal year	0	[3]
Amounts reclassified from accumulated other comprehensive income	210	[3]	0	[4]
Net current-period other comprehensive income	30	[3]	(9)	[4]
Ending balance	$ (179)	[3]	$ (244)	[4]

[1] Net of taxes of $2,825 and $2,900 for the periods ended March 31, 2014 and December 31, 2013, respectively.

[2] Net of taxes of $21,813 and $22,371 for the periods ended March 31, 2013 and December 31, 2012, respectively.

[3] Net of taxes of $96 and $110 for the periods ended March 31, 2014 and December 31, 2013, respectively.

[4] Net of taxes of $126 and $127 for the periods ended March 31, 2013 and December 31, 2012, respectively.