Equity and Noncontrolling Interest - Reclassifications (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	$ (45,252)	$ (30,536)	$ (41,855)	$ (28,967)
Other Comprehensive Income (Loss) Before Reclassifications	2,005	2,104	(1,570)	262
Reclassifications From Accumulated Comprehensive Income Loss To Income Statement	21	698	854	1,991
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	2,026	2,802	(716)	2,253
Related Tax Amounts	(12)	(491)	(667)	(1,511)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	2,014	2,311	(1,383)	742
Accumulated Other Comprehensive Loss, Balance at End of Period	(43,238)	(28,225)	(43,238)	(28,225)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(1,646)	1,182	3,336	4,709
Other Comprehensive Income (Loss) Before Reclassifications	2,527	1,604	(2,455)	(1,923)
Reclassifications From Accumulated Comprehensive Income Loss To Income Statement	0	0	0	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	2,527	1,604	(2,455)	(1,923)
Related Tax Amounts	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	2,527	1,604	(2,455)	(1,923)
Accumulated Other Comprehensive Loss, Balance at End of Period	881	2,786	881	2,786
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(45,046)	(33,206)	(46,914)	(34,260)
Other Comprehensive Income (Loss) Before Reclassifications	(1,016)	(312)	(468)	(204)
Reclassifications From Accumulated Comprehensive Income Loss To Income Statement	1,019	746	3,140	2,243
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	3	434	2,672	2,039
Related Tax Amounts	(183)	(230)	(984)	(781)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(180)	204	1,688	1,258
Accumulated Other Comprehensive Loss, Balance at End of Period	(45,226)	(33,002)	(45,226)	(33,002)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	0	(73)	0	(272)
Other Comprehensive Income (Loss) Before Reclassifications	0	38	0	26
Reclassifications From Accumulated Comprehensive Income Loss To Income Statement	0	74	0	392
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	0	112	0	418
Related Tax Amounts	0	(39)	0	(146)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0	73	0	272
Accumulated Other Comprehensive Loss, Balance at End of Period	0	0	0	0
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	1,440	1,561	1,723	856
Other Comprehensive Income (Loss) Before Reclassifications	494	774	1,353	2,363
Reclassifications From Accumulated Comprehensive Income Loss To Income Statement	(998)	(122)	(2,286)	(644)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(504)	652	(933)	1,719
Related Tax Amounts	171	(222)	317	(584)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(333)	430	(616)	1,135
Accumulated Other Comprehensive Loss, Balance at End of Period	$ 1,107	$ 1,991	$ 1,107	$ 1,991