Accumulated Other Comprehensive Loss (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
Beginning Balance	$ (46,375)			$ (54,321)
Other comprehensive income (loss) before reclassifications	9,067			16,640
Amounts reclassified from AOCI	(34)			339
Net current-period other comprehensive income (loss)	9,033			16,979
Balance at June 30, 2014	(37,342)			(37,342)
Accumulated Translation Adjustment [Member]
Beginning Balance	7,621			(2,409)
Other comprehensive income (loss) before reclassifications	11,330	[1]		21,360	[2]
Amounts reclassified from AOCI	0			0
Net current-period other comprehensive income (loss)	11,330			21,360
Balance at June 30, 2014	18,951			18,951
Other comprehensive income (loss), translation adjustment, net of tax, attributable to noncontrolling interests	23			(554)
Net Investment Hedging [Member]
Beginning Balance	(3,481)			(1,884)
Other comprehensive income (loss) before reclassifications	(1,975)			(3,572)
Amounts reclassified from AOCI	0			0
Net current-period other comprehensive income (loss)	(1,975)			(3,572)
Balance at June 30, 2014	(5,456)			(5,456)
Interest Rate Swaps [Member]
Beginning Balance	(843)			(960)
Other comprehensive income (loss) before reclassifications	145		337	319		542
Amounts reclassified from AOCI	(52)		(51)	(109)		(111)
Net current-period other comprehensive income (loss)	93		286	210		431
Balance at June 30, 2014	(750)			(750)
Pension Benefits [Member]
Beginning Balance	(51,565)			(52,027)
Other comprehensive income (loss) before reclassifications	0			0
Amounts reclassified from AOCI	463			925
Net current-period other comprehensive income (loss)	463			925
Balance at June 30, 2014	(51,102)			(51,102)
Available-for-sale Securities [Member]
Beginning Balance	1,613			2,679
Other comprehensive income (loss) before reclassifications	(433)		2,066	(1,467)		2,050
Amounts reclassified from AOCI	(445)		(71)	(477)		(127)
Net current-period other comprehensive income (loss)	(878)			(1,944)
Balance at June 30, 2014	735			735
Other Comprehensive Income - Other [Member]
Beginning Balance	280			280
Other comprehensive income (loss) before reclassifications	0			0
Amounts reclassified from AOCI	0			0
Net current-period other comprehensive income (loss)	0		7	0		14
Balance at June 30, 2014	$ 280			$ 280

[1] Other comprehensive income (loss) before reclassifications within the translation component excludes $23 of translation attributable to noncontrolling interests.

[2] Other comprehensive income (loss) before reclassifications within the translation component excludes $(554) of translation attributable to noncontrolling interests.