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INTANGIBLE ASSETS - Summary of intangible assets other than goodwill (Details) (USD $) In Thousands, unless otherwise specified
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3 Months Ended |
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Mar. 31, 2014
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Dec. 31, 2013
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| Finite-Lived Intangible Assets [Line Items] |
|
|
| Gross Carrying Amount |
$ 29,804 |
$ 28,893 |
| Accumulated Amortization |
(17,936) |
(16,895) |
| Net Book Value |
11,868 |
11,998 |
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Purchased and developed software
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|
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| Finite-Lived Intangible Assets [Line Items] |
|
|
| Weighted Remaining Average Useful Lives |
2 years |
|
| Gross Carrying Amount |
9,361 |
8,836 |
| Accumulated Amortization |
(4,362) |
(3,706) |
| Net Book Value |
4,999 |
5,130 |
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Patents and trademarks
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|
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| Finite-Lived Intangible Assets [Line Items] |
|
|
| Weighted Remaining Average Useful Lives |
4 years 9 months 18 days |
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| Gross Carrying Amount |
3,260 |
3,260 |
| Accumulated Amortization |
(1,295) |
(1,172) |
| Net Book Value |
1,965 |
2,088 |
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Customer relationships
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|
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| Finite-Lived Intangible Assets [Line Items] |
|
|
| Weighted Remaining Average Useful Lives |
4 years 4 months 24 days |
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| Gross Carrying Amount |
2,231 |
2,231 |
| Accumulated Amortization |
(699) |
(602) |
| Net Book Value |
1,532 |
1,629 |
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Licenses and other intangible assets
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|
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| Finite-Lived Intangible Assets [Line Items] |
|
|
| Weighted Remaining Average Useful Lives |
1 year 4 months 24 days |
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| Gross Carrying Amount |
12,728 |
12,646 |
| Accumulated Amortization |
(11,580) |
(11,415) |
| Net Book Value |
1,148 |
1,231 |
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Software and other intangible assets in development and not in service
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|
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| Finite-Lived Intangible Assets [Line Items] |
|
|
| Gross Carrying Amount |
2,224 |
1,920 |
| Accumulated Amortization |
|
|
| Net Book Value |
$ 2,224 |
$ 1,920 |