Other Comprehensive Income Details 2 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (1,343)	$ (2,039)	$ (3,748)	$ (7,127)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(229)	(278)	(627)	(1,045)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(1,114)	(1,761)	(3,121)	(6,082)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	3,996	2,675	19,964	9,545
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent	1,033	761	6,166	2,590
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	2,963	1,914	13,798	6,955
3.24% $100 Million Interest Rate Swap [Member]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	258	777	784	2,312
Foreign Exchange Forward [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ (1,601)	$ (2,816)	$ (4,532)	$ (9,439)