Accumulated Other Comprehensive Income (AOCI) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 498,863
Ending balance	521,545
Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(108,655)	$ (55,240)
Other comprehensive income/(loss) before reclassifications	2,216	(44,316)
Interest expense related to swaps reclassified to the Statement of Income, net of tax
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax
Net current period other comprehensive income/(loss)	2,216	(44,316)
Ending balance	(106,439)	(99,556)
Pension and Postretirement Liability Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(48,725)	(51,666)
Other comprehensive income/(loss) before reclassifications	330	1,735
Interest expense related to swaps reclassified to the Statement of Income, net of tax
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax	372	714
Net current period other comprehensive income/(loss)	702	2,449
Ending balance	(48,023)	(49,217)
Derivative Valuation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,464)	(861)
Other comprehensive income/(loss) before reclassifications	(4,300)	(2,374)
Interest expense related to swaps reclassified to the Statement of Income, net of tax	1,045	939
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax
Net current period other comprehensive income/(loss)	(3,255)	(1,435)
Ending balance	(4,719)	(2,296)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(158,844)	(107,767)
Other comprehensive income/(loss) before reclassifications	(1,754)	(44,955)
Interest expense related to swaps reclassified to the Statement of Income, net of tax	1,045	939
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax	372	714
Net current period other comprehensive income/(loss)	(337)	(43,302)
Ending balance	$ (159,181)	$ (151,069)