Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (107,767)	$ (49,498)	$ (80,021)
Other comprehensive income/(loss) before reclassifications	(53,013)	(55,902)	8,877
Pension/postretirement settlements and curtailments	103	5,167
Pension/postretirement plan remeasurement	(622)	(9,265)	13,771
Interest expense related to swaps reclassified to the Statement of Income, net of tax	1,233	1,168	1,159
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax	1,222	563	2,226
Net current period other comprehensive income	(51,077)	(58,269)	30,523
Ending balance	(158,844)	(107,767)	(49,498)
Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits			4,864
Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits			(374)
Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(55,240)	(138)	(7,659)
Other comprehensive income/(loss) before reclassifications	$ (53,415)	$ (55,102)	$ 7,521
Pension/postretirement settlements and curtailments
Pension/postretirement plan remeasurement
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	$ (53,415)	$ (55,102)	$ 7,521
Ending balance	(108,655)	$ (55,240)	$ (138)
Translation Adjustments [Member] | Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits
Translation Adjustments [Member] | Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits
Pension and Postretirement Liability Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(51,666)	$ (48,383)	$ (69,484)
Other comprehensive income/(loss) before reclassifications	2,238	252	614
Pension/postretirement settlements and curtailments	103	5,167
Pension/postretirement plan remeasurement	$ (622)	$ (9,265)	$ 13,771
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	$ 1,222	$ 563	$ 2,226
Net current period other comprehensive income	2,941	(3,283)	21,101
Ending balance	(48,725)	(51,666)	(48,383)
Pension and Postretirement Liability Adjustments [Member] | Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits			4,864
Pension and Postretirement Liability Adjustments [Member] | Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits			(374)
Derivative Valuation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(861)	(977)	(2,878)
Other comprehensive income/(loss) before reclassifications	$ (1,836)	$ (1,052)	$ 742
Pension/postretirement settlements and curtailments
Pension/postretirement plan remeasurement
Interest expense related to swaps reclassified to the Statement of Income, net of tax	$ 1,233	$ 1,168	$ 1,159
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax
Net current period other comprehensive income	$ (603)	$ 116	$ 1,901
Ending balance	$ (1,464)	$ (861)	$ (977)
Derivative Valuation Adjustment [Member] | Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits
Derivative Valuation Adjustment [Member] | Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits