Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ 21,283	$ 24,156	$ 35,875	$ 57,860
Changes in cumulative translation adjustment and other, before and after tax	(14,592)	(33,704)
Other Comprehensive Income Amortization Of Pension And Post Retirement Net Of Tax	3,127	5,419
Accumulated Other Comprehensive (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning of period	(438,248)	(587,619)
Accumulated other comprehensive loss, end of period	(449,713)	(615,904)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	3,807	5,754
Accumulated Other Comprehensive (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning of period	(477,883)	(648,113)
Accumulated other comprehensive loss, end of period	(474,076)	(642,359)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(680)	(335)
Accumulated Other Comprehensive (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning of period	3,760	2,634
Accumulated other comprehensive loss, end of period	3,080	2,299
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	$ 0	$ 0