Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ 23,216	$ 17,985
AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	24,403	18,934
Total other comprehensive income (loss), Tax	(1,187)	(949)
Other comprehensive income (loss)	23,216	17,985
Cumulative translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	21,050	16,217
Total other comprehensive income (loss), Tax	0	0
Other comprehensive income (loss)	21,050	16,217
Pension and other postretirement adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	1,676	993
Total other comprehensive income (loss), Tax	(552)	(322)
Other comprehensive income (loss)	1,124	671
Reclassification adjustments for derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	1,677	1,724
Total other comprehensive income (loss), Tax	(635)	(627)
Other comprehensive income (loss)	$ 1,042	$ 1,097