Equity and Noncontrolling Interest - AOCI Reclassifications (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ (41,855)	$ (28,967)	$ (12,753)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	10,235	(19,211)	(20,259)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,419	2,399	1,192
Related Tax Amount	(4,499)	3,924	2,853
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(34,700)	(41,855)	(28,967)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	3,336	4,709	13,368
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(2,184)	(1,373)	(8,659)
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	1,152	3,336	4,709
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(46,914)	(34,260)	(26,448)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	9,876	(20,045)	(12,783)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	4,177	2,875	1,976
Related Tax Amount	(4,572)	4,516	2,995
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(37,433)	(46,914)	(34,260)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	0	(272)	(667)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	26	(52)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	392	660
Related Tax Amount	0	(146)	(213)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	0	0	(272)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	1,723	856	994
Other Comprehensive Income (Loss), before Reclassifications, before Tax	2,543	2,181	1,235
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(2,758)	(868)	(1,444)
Related Tax Amount	73	(446)	71
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ 1,581	$ 1,723	$ 856