CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fixed Maturities, available-for-sale, Amortized cost	$ 3,809,978	$ 3,379,864
Other Investments, Cost	10,995	10,862
Reinsurance balance receivable, net	600,229	512,996
Reinsurance recoverable on unpaid losses	91,382	75,873
Deferred commissions and other acquisition expenses	443,193	372,487
Reserve for loss and loss adjustment expenses	2,459,293	2,271,292
Unearned premiums	$ 1,483,882	$ 1,207,757
Common shares, par value (in USD per share)	$ 0.01	$ 0.01
Common shares, issued	74,603,623	73,900,889
Common shares, shares outstanding	73,588,978	72,932,702
Treasury shares, shares	1,014,645	968,187
Related Party Transactions
Reinsurance balance receivable, net	$ 302,258	$ 267,490
Reinsurance recoverable on unpaid losses	3,251	3,845
Deferred commissions and other acquisition expenses	358,843	285,227
Reserve for loss and loss adjustment expenses	1,330,145	1,167,041
Unearned premiums	$ 1,139,088	$ 914,087