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Taxes on Income, Reconciliation of Liability for Unrecognized Tax Benefits (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of the beginning and ending amount of the liability for unrecognized tax benefits [Roll Forward]      
Balance at beginning of year $ 1,171,000 $ 949,000 $ 1,045,000
Additions based on tax positions related to the current year 339,000 470,000 239,000
Additions for tax positions of prior years 785,000 39,000 114,000
Reductions for tax positions of prior years (337,000) (287,000) (413,000)
Settlements 0 0 (36,000)
Balance at end of year 1,958,000 1,171,000 949,000
Income tax penalties and interest recognized 216,000 40,000 (421,000)
Accrued liabilities for payment of interest and penalties $ 522,000 $ 306,000 $ 266,000