Acquisitions (Results Since Acquisition and Pro Forma Information) (Details) - Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member] - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 103,265
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	$ (14,788)
Business Acquisition, Pro Forma Revenue		$ 1,960,185	$ 2,010,308
Business Acquisition, Pro Forma Net Income (Loss)		$ 70,633	$ 362,143