Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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-Name Accounting Standards Codification

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-Section 45

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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-Publisher SEC

-Name Regulation S-X (SX)

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-Subparagraph (SX 210.5-02.1)

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Represents the number of groups of affiliated entities.

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Summary of significant accounting policies (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Marketable securities
Short-term marketable securities	$ 32,962	$ 41,558
Long-term marketable securities	0	0
Restricted cash
Short-term restricted cash related to letters of credit	545	30
Restricted cash classified as long-term	0	0
Business combinations
Transaction costs associated with business combinations	$ 354	$ 50	$ 0
Total revenue \| Affiliated entities
Concentrations of credit risk
Concentration risk percentage			18.00%
Number of groups of affiliated entities	2	2	1
Total revenue \| Affiliated entities group one
Concentrations of credit risk
Concentration risk percentage	14.00%	17.00%
Total revenue \| Affiliated entities group two
Concentrations of credit risk
Concentration risk percentage	14.00%	15.00%
Total accounts receivable \| Affiliated entities
Concentrations of credit risk
Concentration risk percentage	12.00%
Number of groups of affiliated entities	1	3
Total accounts receivable \| Affiliated entities group one
Concentrations of credit risk
Concentration risk percentage		26.00%
Total accounts receivable \| Affiliated entities group two
Concentrations of credit risk
Concentration risk percentage		16.00%
Total accounts receivable \| Affiliated entities group three
Concentrations of credit risk
Concentration risk percentage		10.00%