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Investments - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 04, 2018 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) security shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) security shares	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) security shares
Debt Securities, Available-for-sale [Line Items]
Number of fixed maturity and equity securities | security		738		738		126
Percentage of gross unrealized loss		100.00%		100.00%		100.00%
Common stock, shares issued (in shares) | shares		45,188,169		45,188,169		44,570,004
Gain resulting from change in accounting method		$ 819	$ (526)	$ 2,886	$ 1,294
Fixed maturity securities | Investment grade
Debt Securities, Available-for-sale [Line Items]
Percentage of gross unrealized loss		85.30%		85.30%		7.30%
Percentage of fair value		94.00%		94.00%		10.40%
Not designated as hedging instrument | Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Investments at fair value		$ 10,700		$ 10,700		$ 12,300
Gain (loss) resulting from changes in fair value of securities		(200)	$ 600	$ 500	$ 0
Inseego Corp
Debt Securities, Available-for-sale [Line Items]
Common stock, shares issued (in shares) | shares	12,000,000
Price per share (in dollars per share) | $ / shares	$ 1.63
Proceeds from issuance of stock	$ 19,700
Inseego Corp | Inseego Corp
Debt Securities, Available-for-sale [Line Items]
Gain resulting from change in accounting method		$ 44,200

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