Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets
Fixed maturities, at amortized cost or cost	$ 5,547,838	$ 5,556,900
Short-term investments, at amortized cost or cost	2,481,573	1,941,615
Other investments, at amortized cost or cost	371,668	315,963
Investments in and advance to affiliates, subsidiaries, associates, and joint ventures, at cost	$ 86,305	$ 70,186
Preferred shares - Shareholders' Equity
Preferred shares, shares issued	6,000	0
Preferred shares, shares outstanding	6,000	0
Common Shares - Shareholders' Equity
Common shares, shares issued	161,273,353	160,570,772
Common shares, shares outstanding	79,443,030	82,900,617
Treasury stock, common shares	81,830,323	77,670,155