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Income Taxes - Components of the Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
U.S. Federal $ 1,663 $ 1,855 $ 958
U.S. State 1 1 (5)
Ireland 0 0 0
Total current provision 1,664 1,856 953
Deferred:      
U.S. Federal (963) (1,045) (538)
U.S. State 0 0 0
Ireland 0 0 0
Total deferred benefit (963) (1,045) (538)
Provision for income taxes $ 701 $ 811 $ 415