Schedule II Financial Information of Registrant Parent Company Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from investing activities:
Proceeds from sales of Fixed-maturity investments available-for-sale	$ 728,584	$ 888,219	$ 687,173
Proceeds from sales of Trading securities	58,317	194,784	290,855
Proceeds from sales of Equity securities	95,697	38,318	74,868
Proceeds from redemptions of Fixed-maturity investments available for sale	457,595	463,548	337,630
Proceeds from redemptions of Trading securities	54,329	79,296	123,645
Purchases of Fixed-maturity investments available for sale	(1,875,069)	(1,947,916)	(1,990,652)
Sales, redemptions and (purchases) of Short-term investments, net	(108,325)	324,258	334,456
Acquisition of subsidiaries	(7,964)	(86)	(150)
Cash flows from financing activities:
Dividends paid	(2,140)	(2,154)	(2,105)
Issuance of senior notes, net	0	442,163	343,417
Purchases and redemptions of senior notes	0	(593,527)	(445,072)
Proceeds from termination of capped calls	0	4,208	0
Issuance of common stock	1,385	7,132	717
Purchase of common shares	(50,053)	(6)	(100,188)
Excess tax benefits from stock-based awards (Note A)	0	0	333
Increase (decrease) in cash and restricted cash	10,758	34,430	1,916
Cash and restricted cash, beginning of period	96,244	61,814	59,898
Cash and restricted cash, end of period	107,002	96,244	61,814
Parent Company
Cash flows from operating activities:
Net cash provided by (used in) operating activities	254,698	(23,654)	38,902
Cash flows from investing activities:
Proceeds from sales of Fixed-maturity investments available-for-sale	6,779	58,007	47,058
Proceeds from sales of Trading securities	0	0	30,350
Proceeds from sales of Equity securities	0	0	24,992
Proceeds from redemptions of Fixed-maturity investments available for sale	12,391	60,414	49,578
Proceeds from redemptions of Trading securities	0	0	10,000
Purchases of Fixed-maturity investments available for sale	(37,552)	(134,456)	(137,431)
Sales, redemptions and (purchases) of Short-term investments, net	(131,164)	210,529	(40,288)
Sales, redemptions and (purchases) of Other assets, net	(3,317)	(1,107)	239
Capital distributions from subsidiaries	0	924	15,000
Capital contributions to subsidiaries	(30,338)	(21,643)	(1,500)
Acquisition of subsidiaries	0	0	(30,443)
(Issuance) repayment of note receivable from affiliate (Note C)	0	(44)	201,631
Net cash provided by (used in) investing activities	(183,201)	172,624	169,186
Cash flows from financing activities:
Dividends paid	(2,140)	(2,154)	(2,105)
Issuance of senior notes, net	0	442,163	343,417
Purchases and redemptions of senior notes	0	(593,527)	(445,072)
Proceeds from termination of capped calls	0	4,208	0
Issuance of common stock	1,385	7,132	717
Purchase of common shares	(50,053)	(6)	(100,188)
Credit facility commitment fees paid	(1,510)	(1,993)	0
Excess tax benefits from stock-based awards (Note A)	0	0	98
Net cash provided by (used in) financing activities	(52,318)	(144,177)	(203,133)
Increase (decrease) in cash and restricted cash	19,179	4,793	4,955
Cash and restricted cash, beginning of period	13,173	8,380	3,425
Cash and restricted cash, end of period	$ 32,352	$ 13,173	$ 8,380

The carrying amounts of cash and cash equivalent items, both unrestricted and restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

No definition available.