At June 30, acquired intangible assets subject to amortization consisted of the following:
| 2013 | ||||||||||||||||
| Weighted-Average Amortization Period (In Years) |
Gross Carrying Amount |
Accumulated Amortization |
Net Book Value |
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|
Contract-based intangibles |
3 | $ | 1,766 | $ | 1,766 | $ | — | |||||||||
|
Internet respondent database |
7 | 3,148 | 3,144 | 4 | ||||||||||||
|
Customer relationships |
10 | 20,447 | 14,838 | 5,609 | ||||||||||||
|
Trade names |
16 | 5,248 | 2,800 | 2,448 | ||||||||||||
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Total |
$ | 30,609 | $ | 22,548 | $ | 8,061 | ||||||||||
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| 2012 | ||||||||||||||||
| Weighted-Average Amortization Period (In Years) |
Gross Carrying Amount |
Accumulated Amortization |
Net Book Value |
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|
Contract-based intangibles |
3 | $ | 1,768 | $ | 1,768 | $ | — | |||||||||
|
Internet respondent database |
7 | 3,080 | 2,861 | 219 | ||||||||||||
|
Customer relationships |
10 | 20,849 | 12,974 | 7,875 | ||||||||||||
|
Trade names |
16 | 5,250 | 2,549 | 2,701 | ||||||||||||
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Total |
$ | 30,947 | $ | 20,152 | $ | 10,795 | ||||||||||