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Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Long-lived Assets |  |
Fixed assets, net | $ 52,914 | $ 47,737
Goodwill and Intangible Assets |  |
Goodwill and Intangibles | 783,314 | 663,224
United States [Member] |  |
Long-lived Assets |  |
Fixed assets, net | 45,068 | 39,555
Goodwill and Intangible Assets |  |
Goodwill and Intangibles | 698,083 | 577,388
Canada [Member] |  |
Long-lived Assets |  |
Fixed assets, net | 6,145 | 7,003
Goodwill and Intangible Assets |  |
Goodwill and Intangibles | 85,231 | 85,836
Other Geographical Location [Member] |  |
Long-lived Assets |  |
Fixed assets, net | 1,701 | 1,179
Goodwill and Intangible Assets |  |
Goodwill and Intangibles | $ 0 | $ 0

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- Definition Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions + References No definition available. + Details
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