Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments
Amortized Cost	$ 2,793,350	$ 2,306,914
Property and equipment
Accumulated depreciation	53,870	50,466
Credit Facility Borrowings
Unamortized deferred costs	$ 1,336	$ 1,409
Stockholders' Equity
Common Shares, par value (in dollars per share)	$ 0.015	$ 0.015
Common Shares, authorized (in shares)	233,333,000	233,333,000
Common Shares, issued (in shares)	98,139,000	98,434,000
Common Shares, outstanding (in shares)	98,139,000	98,434,000
Fixed maturities
Investments
Amortized Cost	$ 2,638,950	$ 1,994,200
Short-term investments
Investments
Amortized Cost	$ 154,400	$ 312,714