Equity and Noncontrolling Interest - Reclassifications (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
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	$ (33,015)	$ (41,747)	$ (34,700)	$ (41,855)
Other Comprehensive Income (Loss) Before Reclassifications	1,948	(3,855)	3,705	(3,574)
Reclassifications From Accumulated Comprehensive Income Loss To Income Statement	(339)	270	(128)	832
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	1,609	(3,585)	3,577	(2,742)
Related Tax Amounts	(181)	80	(464)	(655)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,428	(3,505)	3,113	(3,397)
Accumulated Other Comprehensive Loss, Balance at End of Period	(31,587)	(45,252)	(31,587)	(45,252)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	2,222	1,706	1,152	3,336
Other Comprehensive Income (Loss) Before Reclassifications	986	(3,352)	2,056	(4,982)
Reclassifications From Accumulated Comprehensive Income Loss To Income Statement	0	0	0	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	986	(3,352)	2,056	(4,982)
Related Tax Amounts	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	986	(3,352)	2,056	(4,982)
Accumulated Other Comprehensive Loss, Balance at End of Period	3,208	(1,646)	3,208	(1,646)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(36,887)	(45,608)	(37,433)	(46,914)
Other Comprehensive Income (Loss) Before Reclassifications	120	(214)	144	549
Reclassifications From Accumulated Comprehensive Income Loss To Income Statement	762	1,065	1,531	2,120
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	882	851	1,675	2,669
Related Tax Amounts	(269)	(289)	(516)	(801)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	613	562	1,159	1,868
Accumulated Other Comprehensive Loss, Balance at End of Period	(36,274)	(45,046)	(36,274)	(45,046)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	1,650	2,155	1,581	1,723
Other Comprehensive Income (Loss) Before Reclassifications	842	(289)	1,505	859
Reclassifications From Accumulated Comprehensive Income Loss To Income Statement	(1,101)	(795)	(1,659)	(1,288)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(259)	(1,084)	(154)	(429)
Related Tax Amounts	88	369	52	146
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(171)	(715)	(102)	(283)
Accumulated Other Comprehensive Loss, Balance at End of Period	$ 1,479	$ 1,440	$ 1,479	$ 1,440