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Intangible Assets | 6 Months Ended
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Jun. 30, 2014
Intangible Assets [Abstract] |
Intangible Assets | (5) Intangible Assets Intangible assets other than goodwill at June 30, 2014 and December 31, 2013 were as follows:
| 2014 |  | 2013 |  |  |  |
(in thousands) | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net |  | Useful Life (in years) |  | Weighted Average Useful Life Remaining (in years)
Intangible assets with finite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Licenses | $ | 5,875 |  | $ | (5,875) |  | $ | — |  | $ | 5,875 |  | $ | (5,875) |  | $ | — |  |  |  |
Patent costs |  | 22,211 |  |  | (7,195) |  |  | 15,016 |  |  | 21,545 |  |  | (5,960) |  |  | 15,585 |  | 6 - 7 |  | 3
Acquired technology |  | 44,591 |  |  | (15,410) |  |  | 29,181 |  |  | 30,095 |  |  | (13,615) |  |  | 16,480 |  | 5 - 10 |  | 5
Internally developed software |  | 17,862 |  |  | (13,583) |  |  | 4,279 |  |  | 18,097 |  |  | (12,863) |  |  | 5,234 |  | 5 |  | <1
Customer relationships |  | 113,067 |  |  | (28,021) |  |  | 85,046 |  |  | 95,793 |  |  | (18,283) |  |  | 77,510 |  | 5 - 13 |  | 5
Non-compete agreements |  | 21,010 |  |  | (8,758) |  |  | 12,252 |  |  | 16,848 |  |  | (6,666) |  |  | 10,182 |  | 3 - 11 |  | 3
Trade names |  | 10,708 |  |  | (3,459) |  |  | 7,249 |  |  | 9,302 |  |  | (2,211) |  |  | 7,091 |  | 2 - 10 |  | 3
Other |  | 23,668 |  |  | (4,818) |  |  | 18,850 |  |  | 11,598 |  |  | (4,081) |  |  | 7,517 |  | <1 - 7 |  | 2
Intangibles with indefinite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  | 5,910 |  |  | — |  |  | 5,910 |  |  | 2,110 |  |  | — |  |  | 2,110 |  | N/A |  | N/A
Total intangible assets | $ | 264,902 |  | $ | (87,119) |  | $ | 177,783 |  | $ | 211,263 |  | $ | (69,554) |  | $ | 141,709 |  | <1 - 13 |  | 4
For the six months ended June 30, 2014 and 2013, the Company capitalized $382 and $1,313, respectively, of costs incurred to acquire, develop and extend patents in the United States and various other countries. Amortization expense for intangible assets for the quarter and six months ended June 30, 2014 was $8,211 and $17,414, respectively, compared to $5,084 and $8,896, respectively, for the quarter and six months ended June 30, 2013. Annual amortization expense for intangible assets for 2014, 2015, 2016, 2017 and 2018 is expected to be $33,517, $24,496, $21,784, $18,886 and $14,024, respectively.

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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 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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