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Income Taxes Interest and penalties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accrued interest and penalties (tax) [Abstract]      
Income Tax Examination, Penalties and Interest Expense $ 78 $ 84 $ 0
Income Tax Examination, Penalties and Interest Accrued $ 468 $ 1,067 $ 0