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Revenue - Contract balances (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018
Receivables, inclusive of trade and unbilled	$ 48,217	$ 41,704
Contract Assets (current and non-current)	8,167	12,449
Contract Liabilities (Deferred Revenue current and non-current)	$ 33,752	$ 37,622
Revenue, Practical Expedient, Financing Component [true/false]		true
Contract liabilities increase due to annual renewals		$ 4,300
Decrease in beginning deferred revenue		$ 20,000
Minimum
The amount of time contract assets are transferred to receivables		3 years
Maximum
The amount of time contract assets are transferred to receivables		5 years
Dealflo Limited
Decrease in beginning deferred revenue		$ 1,300

X

- Definition

Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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+ Details

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

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X

- Definition

Indicates (true/false) whether practical expedient is elected not to adjust consideration for effect of financing component when transfer and customer payment of good or service occurs within one year or less.

+ References

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

The amount of time the contract assets are transferred to receivables when the right to billion normally occurs.

+ References

No definition available.

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X

- Definition

Amount of increase in obligation to transfer good or service to customer for which consideration from customer has been received or is due from annual renewals.

+ References

No definition available.

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