Other Operating Expenses and Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Operating Expenses and Other Expenses [Abstract]
Amortization of policy acquisition costs	$ 21,629	$ 23,150	$ 45,746	$ 41,771
Other underwriting expenses of the operating segments	14,296	14,260	33,521	33,485
Other operating expenses of the Corporate and Other segment	7,472	7,433	15,751	15,339
Total	43,397	44,843	95,018	90,595
Other expenses	$ 1,732	$ 683	$ 1,732	$ 683