Other comprehensive income (loss) and accumulated other comprehensive items (Details) $ in Thousands	3 Months Ended
Mar. 31, 2016 USD ($)
Other comprehensive income (loss) and accumulated other comprehensive items
Balance at the beginning of the period	$ (1,200)
Other comprehensive income before reclassifications	2,284
Other comprehensive income	2,284
Balance at the end of the period	1,084
Unrealized Gains (Losses) On Marketable Securities
Other comprehensive income (loss) and accumulated other comprehensive items
Balance at the beginning of the period	(589)
Other comprehensive income before reclassifications	658
Other comprehensive income	658
Balance at the end of the period	69
Foreign Currency Translation
Other comprehensive income (loss) and accumulated other comprehensive items
Balance at the beginning of the period	(611)
Other comprehensive income before reclassifications	1,626
Other comprehensive income	1,626
Balance at the end of the period	$ 1,015

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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