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Summary of significant accounting policies (Tables)
3 Months Ended
Mar. 31, 2016
Estimated Useful Lives of Intangible Assets Acquired

Intangible assets acquired individually or with a group of other assets or in a business combination are carried at cost less accumulated amortization based on their estimated useful lives as follows:

 

Customer-related intangible assets      1-14 years   
Marketing-related intangible assets      1-10 years   
Other intangible assets      3-9 years