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Income Taxes (Reconciliation of Unrecognized Tax Benefit Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	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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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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