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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Provision (benefit) for income taxes $ (4,561) $ 172 $ 247
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning Balance 2,131 1,454 1,067
Increases related to current year tax positions 2,194 679 408
Decreases related to prior year tax positions 0 (2) (21)
Ending Balance $ 4,325 $ 2,131 $ 1,454