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Employee Benefit Plans (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee Benefit Plans [Abstract] |  |  |
Employee contribution percent | 50.00% | 50.00% | 50.00%
Maximum percentage of employee contribution to the plan | 6.00% | 6.00% | 6.00%
Company's matching contribution | $ 1,367,000 | $ 1,222,000 | $ 1,007,000
Discretionary contributions made | 0 | 0 | 0
Total contributions to retirement plan | $ 205,000 | $ 101,000 | $ 133,000

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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