Equity and Noncontrolling Interest - AOCI Reclassifications (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ (34,700)	$ (41,855)	$ (28,967)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(22,639)	10,235	(19,211)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	798	1,419	2,399
Related Tax Amount	2,135	(4,499)	3,924
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(54,406)	(34,700)	(41,855)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	1,152	3,336	4,709
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(15,464)	(2,184)	(1,373)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0
Related Tax Amount	0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(14,312)	1,152	3,336
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(37,433)	(46,914)	(34,260)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(9,232)	9,876	(20,045)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	3,043	4,177	2,875
Related Tax Amount	2,071	(4,572)	4,516
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(41,551)	(37,433)	(46,914)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	0	0	(272)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	0	26
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	392
Related Tax Amount	0	0	(146)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	0	0	0
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	1,581	1,723	856
Other Comprehensive Income (Loss), before Reclassifications, before Tax	2,057	2,543	2,181
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(2,245)	(2,758)	(868)
Related Tax Amount	64	73	(446)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ 1,457	$ 1,581	$ 1,723