Other Operating Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Operating Expenses [Abstract]
Amortization of policy acquisition costs	$ 24,116	$ 18,621
Other underwriting expenses of the operating segments	19,226	19,225
Other operating expenses of the Corporate and Other segment	8,279	7,906
Total	$ 51,621	$ 45,752