Acquisitions (Details) - USD ($) $ in Thousands  | 
Feb. 01, 2016  | 
Aug. 19, 2015  | 
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| Aurora [Member] | ||
| Business Acquisition [Line Items] | ||
| Purchase price of acquisition | $ 210,026 | |
| DDI [Member] | ||
| Business Acquisition [Line Items] | ||
| Purchase price of acquisition | $ 7,659 | 
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- Definition 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. No definition available. 
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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