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Income Taxes (Details 4) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of the year $ 2,759,000 $ 2,416,000 $ 1,896,000
Increases related to current year tax positions 615,000 331,000 305,000
Increases related to prior year tax positions 2,081,000 12,000 215,000
Balance at end of the year $ 5,455,000 $ 2,759,000 $ 2,416,000