Other Comprehensive Income (Details) - USD ($) $ in Thousands	6 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (282,775)	$ (197,425)		$ (266,649)	$ (212,949)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		19,932	$ (8,238)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(16,716)	(5,127)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	8,828	719
Other Comprehensive Income (Loss), Net of Tax	(16,126)	15,524
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(72,744)	(6,615)		(57,394)	(4,960)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(15,350)	(1,655)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Other Comprehensive Income (Loss), Net of Tax	(15,350)	(1,655)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,239)	12,850		3,016	(1,944)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(3,692)	19,932
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(556)	(817)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(2,007)	(4,321)
Other Comprehensive Income (Loss), Net of Tax	(6,255)	14,794
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(206,792)	(203,660)		$ (212,271)	$ (206,045)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(4,546)	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(810)	(2,655)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	10,835	5,040
Other Comprehensive Income (Loss), Net of Tax	$ 5,479	$ 2,385