Acquisitions (Details) - MI - Subsequent Events	Sep. 14, 2015 USD ($) employee
Acquisitions
Pre-acquisition annual revenues	$ 28,500,000
Number of individuals in employee base \| employee	100
Total consideration for the transaction, excluding acquisition-related costs	$ 80,064,000

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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