Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Cash Provided by (Used in) Operating Activities	$ 83,932	$ 38,929
Cash flows from investing activities:
Proceeds from Sale and Maturity of Fixed-Maturity Investments Available-for-sale	253,121	111,099
Proceeds from Sale of Available-for-sale Securities, Equity	0	74,868
Proceeds from Sale of Trading Securities Held-for-investment	46,688	65,163
Proceeds from Redemption of Fixed-Maturity Investments Available-for-sale	123,683	58,856
Proceeds from Redemption of Trading Securities Held-for-investment	19,543	34,105
Purchases of Fixed-Maturity Investments Available-for-sale	(444,873)	(753,660)
Sales, Redemptions and (Purchases) of Short-term Investments	57,923	341,365
Sales, Redemptions and (Purchases) of Other assets and other invested assets, net	222	132
Purchases of property and equipment, net	(7,687)	(6,518)
Acquisitions, net of cash acquired	(86)	0
Net cash provided by (used in) investing activities	48,534	(74,590)
Cash flows from financing activities:
Dividends paid	(538)	(497)
Issuance of long-term debt, net	0	344,139
Purchases and redemptions of long-term debt	(110,160)	(192,722)
Issuance of common stock	2,865	24
Purchase of common shares	0	(100,188)
Excess tax benefits from share-based awards (Note 1)	0	20
Repayment of other borrowings	(81)	(108)
Net cash provided by (used in) financing activities	(107,914)	50,668
Effect of exchange rate changes on cash and restricted cash	24	(1)
Increase (decrease) in cash and restricted cash	24,576	15,006
Cash and restricted cash, beginning of period	61,814	59,898
Cash and restricted cash, end of period	$ 86,390	$ 74,904