Changes in Accumulated Other Comprehensive Income by Component (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Accumulated other comprehensive income (loss)			$ 25,944	$ (66,752)
Other comprehensive income before reclassifications to consolidated statements of income			(19,513)	(1,635)
Amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statements of income			4,043	8,391
Net current-period other comprehensive income (loss)	(3,625)	18,424	(15,470)	6,756
Accumulated other comprehensive income (loss)	10,474	(59,996)	10,474	(59,996)
Gains and Losses on Cash Flow Hedges
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Accumulated other comprehensive income (loss)			(519)	(432)
Other comprehensive income before reclassifications to consolidated statements of income			(820)	500
Amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statements of income			291	(154)
Net current-period other comprehensive income (loss)			(529)	346
Accumulated other comprehensive income (loss)	(1,048)	(86)	(1,048)	(86)
Pension and Other Postretirement Benefit Items
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Accumulated other comprehensive income (loss)			(73,273)	(146,441)
Other comprehensive income before reclassifications to consolidated statements of income			(8,133)	13,537
Amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statements of income			3,752	4,402
Net current-period other comprehensive income (loss)			(4,381)	17,939
Accumulated other comprehensive income (loss)	(77,654)	(128,502)	(77,654)	(128,502)
Foreign Currency Items
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Accumulated other comprehensive income (loss)			99,736	80,121
Other comprehensive income before reclassifications to consolidated statements of income			(10,560)	(15,672)
Amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statements of income			0	4,143
Net current-period other comprehensive income (loss)			(10,560)	(11,529)
Accumulated other comprehensive income (loss)	$ 89,176	$ 68,592	$ 89,176	$ 68,592