Investment and other (losses) gains - net - Gross Realized Investment and Other Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Available for sale securities gross realized gain (loss)
Realized gains	$ 720	$ 566
Realized losses	(188)	(279)
Net unrealized investment losses recognized on equity securities held	(2,203)	0
Investments and other (losses) gains	$ (1,671)	$ 287

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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