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Goodwill (Tables) | 6 Months Ended
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Jun. 30, 2013
Goodwill |
|  | June 30, |  |  | December 31, |
|  | 2013 |  |  | 2012 |
|  | (in thousands) |
Opening balance |  | $ | 315,441 |  |  | $ | 253,393 |
Current period acquisitions |  |  | 43,877 |  |  |  | 55,759 |
Prior period acquisitions |  |  | - |  |  |  | 1,382 |
Foreign exchange movement |  |  | (4,739 | ) |  |  | 4,907 |
Closing balance |  | $ | 354,579 |  |  | $ | 315,441 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
Name: | us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration