Accumulated Other Comprehensive Income (AOCI) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 498,863
Ending balance	512,356
Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(108,655)	$ (55,240)
Other comprehensive income/(loss) before reclassifications	2,393	(26,023)
Pension/postretirement plan remeasurements, net of tax
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)	2,393	(26,023)
Ending balance	(106,262)	(81,263)
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	12	1,125
Pension/postretirement plan remeasurements, net of tax	105
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	244	485
Net current period other comprehensive income/(loss)	361	1,610
Ending balance	(48,364)	(50,056)
Derivative Valuation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,464)	(861)
Other comprehensive income/(loss) before reclassifications	(4,608)	(744)
Pension/postretirement plan remeasurements, net of tax
Interest expense related to swaps reclassified to the Statement of Income, net of tax	363	581
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax
Net current period other comprehensive income/(loss)	(4,245)	(163)
Ending balance	(5,709)	(1,024)
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	(2,203)	(25,642)
Pension/postretirement plan remeasurements, net of tax	105
Interest expense related to swaps reclassified to the Statement of Income, net of tax	363	581
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax	244	485
Net current period other comprehensive income/(loss)	(1,491)	(24,576)
Ending balance	$ (160,335)	$ (132,343)