Commitments and Contingencies- Commitments as a Result of Acquisitions (Details) - EEX |
Mar. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
Jun. 30, 2014
GBP (£)
|
|---|---|---|---|
| Loss Contingencies [Line Items] | |||
| Business combination, contingent consideration arrangements, range of outcomes, value, high (up to) | $ 6,304,000 | £ 4,500,000 | |
| Business combination, contingent consideration, liability | $ 0 | $ 0 |
| X | ||||||||||
- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of liability recognized arising from contingent consideration in a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- 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.
|
| X | ||||||||||
- Details
|