Taxes On Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective tax rate	35.70%	36.00%	37.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax				$ 2,500
Net deferred tax assets	$ 13,155	$ 13,953
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforward Expiration Date				2031
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration				$ 10,700
State and Local Jurisdiction [Member]
Operating Loss Carryforward Expiration Date	2031			2031
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 10,300			$ 53,100
State And Local Jurisdiction Second Expiration [Member]
Operating Loss Carryforward Expiration Date				2021
Deferred Tax Assets, Operating Loss Carryforwards, State and Local				$ 600