Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investments available for sale
Amortized cost (in dollars)	$ 1,233,300	$ 1,050,901
Property and equipment
Accumulated depreciation (in dollars)	$ 41,646	$ 39,260
Stockholders’ Equity
Common Shares, par value (in dollars per share)	$ 0.015	$ 0.015
Common Shares, authorized	233,333	233,333
Common Shares, issued	92,653	92,546
Fixed maturities
Investments available for sale
Amortized cost (in dollars)	$ 1,111,701	$ 840,213
Short-term investments
Investments available for sale
Amortized cost (in dollars)	$ 121,599	$ 210,688