8. Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	$ 340,717,000	$ 274,532,000	$ 198,500,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	65,700,000	80,500,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	700,000	(4,700,000)
Other comprehensive income, net of tax	66,349,000	75,863,000	859,000
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	189,400,000	172,900,000	149,200,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	16,700,000	23,600,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(200,000)	100,000
Other comprehensive income, net of tax	16,500,000	23,700,000
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	(8,100,000)	(8,100,000)	200,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(500,000)	(8,500,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	500,000	200,000
Other comprehensive income, net of tax	0	(8,300,000)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	159,400,000	109,700,000	49,300,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	49,500,000	65,400,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	200,000	(5,000,000)
Other comprehensive income, net of tax	49,700,000	60,400,000
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	340,700,000	274,500,000	198,700,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	65,700,000	80,500,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	500,000	(4,700,000)
Other comprehensive income, net of tax	66,200,000	75,800,000
Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	0	(200,000)	(200,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	200,000	0
Other comprehensive income, net of tax	200,000	0
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	340,700,000	274,300,000
Other comprehensive income, net of tax	$ 66,400,000	$ 75,800,000