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Operations and Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Balance at the beginning of the year |  |  |
Goodwill | $ 121,053 | $ 89,991 |
Accumulated impairment losses | (21,204) | (19,922) |
Goodwill at the beginning of the period, net | 99,849 | 70,069 |
Goodwill acquired | 22,826 | 32,230 |
Foreign exchange | 496 | (833) |
Impairment | (2,346) | (1,282) | (6,292)
Reclassifications | 1,156 | (335) |
Balance at the end of the year |  |  |
Goodwill | 145,531 | 121,053 | 89,991
Accumulated impairment losses | (23,550) | (21,204) | (19,922)
Goodwill at the end of the period, net | 121,981 | 99,849 | 70,069
North America |  |  |
Balance at the beginning of the year |  |  |
Goodwill | 84,567 | 52,427 |
Accumulated impairment losses | (10,666) | (10,666) |
Goodwill at the beginning of the period, net | 73,901 | 41,761 |
Goodwill acquired | 3,581 | 32,230 |
Foreign exchange | 101 | (90) |
Reclassifications | 1,156 |  |
Balance at the end of the year |  |  |
Goodwill | 89,405 | 84,567 |
Accumulated impairment losses | (10,666) | (10,666) |
Goodwill at the end of the period, net | 78,739 | 73,901 |
Europe |  |  |
Balance at the beginning of the year |  |  |
Goodwill | 34,538 | 35,623 |
Accumulated impairment losses | (10,538) | (9,256) |
Goodwill at the beginning of the period, net | 24,000 | 26,367 |
Goodwill acquired | 19,245 |  |
Foreign exchange | 364 | (750) |
Impairment | (2,346) | (1,282) | (6,292)
Reclassifications |  | (335) |
Balance at the end of the year |  |  |
Goodwill | 54,147 | 34,538 | 35,623
Accumulated impairment losses | (12,884) | (10,538) | (9,256)
Goodwill at the end of the period, net | 41,263 | 24,000 | 26,367
Asia/Pacific |  |  |
Balance at the beginning of the year |  |  |
Goodwill | 1,948 | 1,941 |
Goodwill at the beginning of the period, net | 1,948 | 1,941 |
Foreign exchange | 31 | 7 |
Balance at the end of the year |  |  |
Goodwill | 1,979 | 1,948 |
Goodwill at the end of the period, net | 1,979 | 1,948 |
Australia |  |  |
Carrying amount of goodwill by reportable segment |  |  |
Marginal percentage by which the company passed annual impairment test | 8.00% |  |
Balance at the end of the year |  |  |
Goodwill | 2,000 |  |
Number of locations into which the activities will be consolidated | 3 |  |
United States |  |  |
Balance at the end of the year |  |  |
Number of locations into which the activities will be consolidated | 4 |  |
S&P Clever |  |  |
Carrying amount of goodwill by reportable segment |  |  |
Marginal percentage by which the company passed annual impairment test | 2.00% |  |
Balance at the end of the year |  |  |
Goodwill | $ 19,900 |  |
Number of locations into which the activities will be consolidated | 7 |  |

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