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Intangible Assets (Text Block) | 9 Months Ended
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Sep. 30, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets [Text Block] | Intangible Assets The gross carrying amount and accumulated amortization of our intangible assets, other than goodwill, were as follows:
| September 30, 2017 |  | December 31, 2016
| Gross Assets |  | Accumulated Amortization |  | Net |  | Gross Assets |  | Accumulated Amortization |  | Net
| (in thousands)
Core-developed technology | $ | 425,198 |  |  | $ | (393,831 | ) |  | $ | 31,367 |  |  | $ | 372,568 |  |  | $ | (354,878 | ) |  | $ | 17,690 |
Customer contracts and relationships | 256,840 |  |  | (193,317 | ) |  | 63,523 |  |  | 224,467 |  |  | (170,056 | ) |  | 54,411 |
Trademarks and trade names | 69,706 |  |  | (65,537 | ) |  | 4,169 |  |  | 61,785 |  |  | (61,766 | ) |  | 19 |
Other | 11,582 |  |  | (11,062 | ) |  | 520 |  |  | 11,076 |  |  | (11,045 | ) |  | 31 |
Total intangible assets subject to amortization | $ | 763,326 |  |  | $ | (663,747 | ) |  | $ | 99,579 |  |  | $ | 669,896 |  |  | $ | (597,745 | ) |  | $ | 72,151 |
In-process research and development | 710 |  |  | — |  |  | 710 |  |  | — |  |  | — |  |  | — |
Total intangible assets | $ | 764,036 |  |  | $ | (663,747 | ) |  | $ | 100,289 |  |  | $ | 669,896 |  |  | $ | (597,745 | ) |  | $ | 72,151 |
A summary of intangible asset activity is as follows:
| Nine Months Ended September 30,
| 2017 |  | 2016
| (in thousands)
Beginning balance, intangible assets, gross | $ | 669,896 |  |  | $ | 702,507 |
Intangible assets acquired | 36,500 |  |  | — |
Effect of change in exchange rates | 57,640 |  |  | 2,309 |
Ending balance, intangible assets, gross | $ | 764,036 |  |  | $ | 704,816 |
On June 1, 2017, we completed the acquisition of Comverge Inc. by purchasing 100% of the voting stock of Peak Holding Corp., its parent company (Comverge). Intangible assets acquired in 2017 are based on the preliminary purchase price allocation relating to this acquisition. Comverge's intangible assets include in-process research and development, which is not amortized until such time as the associated development projects are completed. These projects are expected to be completed in the next three months. Refer to Note 16 for additional information regarding this acquisition. Estimated future annual amortization expense is as follows:
Year Ending December 31, |  | Estimated Annual Amortization
|  | (in thousands)
2017 (amount remaining at September 30, 2017) |  | $ | 5,605 |
2018 |  | 19,065 |
2019 |  | 16,302 |
2020 |  | 14,003 |
2021 |  | 11,995 |
Beyond 2021 |  | 32,609 |
Total intangible assets subject to amortization |  | $ | 99,579 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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