Fair value measurements (investments and hedge ineffectiveness ) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Long-term Investments [Abstract]
Net unrealized losses on investment in mutual funds			$ (191)	$ (103)
Fair value measurements, hedge ineffectiveness
(Loss) gain from derivatives	$ (1,480)	$ 2,897	1,490	4,938
Gain (loss) from change in fair value of hedged debt	1,480	(2,840)	(1,490)	(4,831)
Net decrease in interest expense	0	57	$ 0	107
Funds held for customers [Member] \| Guaranteed investment certificates [Member] \| Canadian [Member]
Available-for-sale securities [Line Items]
Maximum maturity period, debt securities			1 year
Other current assets [Member]
Available-for-sale securities [Line Items]
Realized gain (loss) on available-for-sale securities	$ 0	$ 0	$ 0	$ 0

The maximum maturity period for debt securities held by the entity.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 7

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1),(2)

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 30

-Subparagraph (a)

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Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

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- Definition

Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

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-Paragraph 4A

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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