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Income Taxes (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Reversal of uncertain tax positions $ 209 $ 270  
Liability for uncertain tax positions 1,630   $ 1,712
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations, including interest and penalties $ 293