Other comprehensive income (loss) and accumulated other comprehensive items (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Other comprehensive income and accumulated other comprehensive items
Balance at the beginning of the period	$ (737)
Other comprehensive income/(loss) before reclassifications	1
Other comprehensive income/(loss)	1
Balance at the end of the period	(736)
Unrealized Gains/(Losses) On Marketable Securities
Other comprehensive income and accumulated other comprehensive items
Balance at the beginning of the period	(387)
Other comprehensive income/(loss) before reclassifications	125
Other comprehensive income/(loss)	125
Balance at the end of the period	(262)
Foreign Currency Translation
Other comprehensive income and accumulated other comprehensive items
Balance at the beginning of the period	(350)
Other comprehensive income/(loss) before reclassifications	(124)
Other comprehensive income/(loss)	(124)
Balance at the end of the period	$ (474)

- 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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