Other Comprehensive Income Details 2 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (1,236)	$ (2,761)	$ (2,405)	$ (5,088)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(206)	(427)	(398)	(767)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(1,030)	(2,334)	(2,007)	(4,321)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	12,008	3,428	15,968	6,869
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent	4,110	911	5,133	1,829
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	7,898	2,517	10,835	5,040
3.24% $100 Million Interest Rate Swap [Member]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	262	771	526	1,535
Foreign Exchange Forward [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ (1,498)	$ (3,532)	$ (2,931)	$ (6,623)