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Income Taxes (Reconciliation of Unrecognized Tax Benefit Accounts) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Abstract] |  |  |  |
Unrecognized tax benefit, Beginning balance | $ 18,786 | $ 16,785 | $ 18,735 |
Increase in balance related to tax positions taken in prior year |  |  | 1,942 |
Decrease in balance related to tax positions taken in prior year |  |  |  | $ (44)
Increase in balance related to tax positions taken during current year | 1,661 | 2,001 |  | 1,827
Decrease in balance related to tax positions taken in current year |  |  | (3,892) |
Unrecognized tax benefit, Ending balance | $ 20,447 | $ 18,786 | $ 16,785 | $ 18,735

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