Other Comprehensive Income Details 2 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (2,761)	$ 614	$ (5,088)	$ 1,341
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(427)	266	(767)	553
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(2,334)	348	(4,321)	788
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	3,428	717	6,869	1,429
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent	911	316	1,829	632
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	2,517	401	5,040	797
Designated as a Cash Flow Hedging Instrument [Member] | 3.24% $100 Million Interest Rate Swap [Member]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	771	778	1,535	1,546
Designated as a Cash Flow Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ (3,532)	$ (164)	$ (6,623)	$ (205)