CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income including non-controlling interests	$ 56,424	$ 66,843
Other comprehensive loss, net of tax:
Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges, net of tax of $94 and $(113) in the three months ended March 31, 2014 and 2013	(421)	602
Defined benefit pension plan activity, net of tax of $1,838 and $3,068 in the three months ended March 31, 2014 and 2013	2,544	5,105
Currency translation adjustment	(12,358)	(14,239)
Other comprehensive loss:	(10,235)	(8,532)
Comprehensive income	46,189	58,311
Comprehensive income attributable to non-controlling interests	652	150
Comprehensive income attributable to shareholders	$ 45,537	$ 58,161