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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Income Taxes [Line Items] |  |  |
Effective income tax rate | 21.00% | 35.00% | 35.00%
Net foreign operating loss carry-forward | $ 85,000 |  |
Valuation allowance recognized | 50,600 | $ 38,800 |
Net change in valuation allowance | (11,800) | 31,400 |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 5,600 |  |
Net federal operating tax loss carry-forward | 863,100,000 | 857,500 |
Net state operating tax loss carry-forward | 412,200 |  |
One-time income inclusion of unremitted earnings as a result of the Tax Act |  | $ 52,400 |
Deferred foreign withholding taxes | 6,225 |  |
Transition tax | $ 49,200 |  |
Transition taxable income inclusion period | 8 years |  |
Transition tax inclusion | $ 41,300 |  |
Transition tax inclusion included in taxable income, period | 6 years |  |
Reduction to deferred tax asset and offsetting valuation allowance | $ 12,300 |  |
Deferred tax asset offset by valuation allowance | 6,000 |  |
Real Estate Investment Trust [Member] |  |  |
Schedule Of Income Taxes [Line Items] |  |  |
Net federal operating tax loss carry-forward | $ 755,400,000 |  |
Minimum [Member] |  |  |
Schedule Of Income Taxes [Line Items] |  |  |
Operating loss carry-forward, expiration year | 2024 |  |
Foreign and state operating tax loss carry forwards expiration date | 2020 |  |
Maximum [Member] |  |  |
Schedule Of Income Taxes [Line Items] |  |  |
Operating loss carry-forward, expiration year | 2037 |  |

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