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Supplemental cash flow information (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Interest $ 11,287 $ 10,108
Income/withholding taxes 14,156 16,809
Iceland [Member]
   
Income/withholding taxes $ 8,259 $ 9,484