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Significant accounting policies (intangibles and impairment of indefinite-lived intangibles and goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
36 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Minimum
Dec. 31, 2013
Maximum
Dec. 31, 2013
Weighted-average
Amortizable intangibles [Line Items]        
Useful life   1 year 20 years 6 years
Impairment of indefinite-lived intangibles and goodwill        
Date of annual impairment test July 31      
Impairment charges, indefinite-lived intangibles $ 0      
Impairment charges, goodwill $ 0