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Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements Of Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net income (loss) | $ (22,887) | $ (5,956) | $ 2,294 | $ (2,140) | $ (28,843) | $ 154
Change in net deferred tax assets |  |  |  |  |  | (69)
Accounts payable and accrued expenses |  |  |  |  | 1,300 | (3,282)
Net cash provided by operating activities |  |  |  |  | $ (23,126) | 3,058
Tax Year 2019 [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net income (loss) |  |  | 2,294 |  |  | 154
Change in net deferred tax assets |  |  |  |  |  | (69)
Accounts payable and accrued expenses |  |  |  |  |  | (3,282)
Net cash provided by operating activities |  |  |  |  |  | 3,058
Tax Year 2019 [Member] | As Reported [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net income (loss) |  |  | 2,357 |  |  | 260
Change in net deferred tax assets |  |  |  |  |  | (30)
Accounts payable and accrued expenses |  |  |  |  |  | (3,427)
Net cash provided by operating activities |  |  |  |  |  | 3,058
Tax Year 2019 [Member] | Adjustments [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net income (loss) |  |  | $ (63) |  |  | (106)
Change in net deferred tax assets |  |  |  |  |  | (39)
Accounts payable and accrued expenses |  |  |  |  |  | $ 145

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