Accumulated Other Comprehensive Income (Loss) (Changes) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances, beginning of period	$ (103,660)	$ 178,721
Other comprehensive income (loss) before reclassifications	19,165	41,652
Amounts reclassified from accumulated other comprehensive loss	7,137	7,141
Other comprehensive income, net of tax	26,302	48,793
Balances, end of period	(46,338)	123,268
Cash flow hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances, beginning of period	(1,485)	(3,912)
Other comprehensive income (loss) before reclassifications	216	(432)
Amounts reclassified from accumulated other comprehensive loss	360	404
Other comprehensive income, net of tax	576	(28)
Balances, end of period	(909)	(3,940)
Available for sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances, beginning of period	120	536
Other comprehensive income (loss) before reclassifications	516	3,465
Amounts reclassified from accumulated other comprehensive loss	69	(11)
Other comprehensive income, net of tax	585	3,454
Balances, end of period	705	3,990
Pension and postretirement benefit plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances, beginning of period	(787,813)	(738,768)
Other comprehensive income (loss) before reclassifications	(1,482)	(1,230)
Amounts reclassified from accumulated other comprehensive loss	6,708	6,748
Other comprehensive income, net of tax	5,226	5,518
Balances, end of period	(782,587)	(733,250)
Foreign currency adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances, beginning of period	(150,955)	(146,491)
Other comprehensive income (loss) before reclassifications	19,915	39,849
Amounts reclassified from accumulated other comprehensive loss	0	0
Other comprehensive income, net of tax	19,915	39,849
Balances, end of period	(131,040)	(106,642)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances, beginning of period	(940,133)	(888,635)
Other comprehensive income, net of tax	26,302	48,793
Balances, end of period	$ (913,831)	$ (839,842)