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Intangible Assets Summary of Intangible Asset Account Activity (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Finite-Lived Intangible Assets [Line Items] | ||
| Beginning balance, intangible assets, gross | $ 804,281 | $ 802,540 |
| Intangible assets acquired | 1,453 | (1,500) |
| Effect of change in exchange rates | (57,586) | 3,241 |
| Ending balance, intangible assets, gross | $ 748,148 | $ 804,281 |