| **Commitments And Contingencies (Details) $ in Thousands** | Jun. 30, 2018 USD ($) |
|------------------------------------------------------------|-----------------------|
| **Commitments And Contingencies [Abstract]**               |                  |
| Aggregate amount accrued for loss contingencies            | $ 18,602              |
| Amount probable of recovery through insurance              | 6,541                 |
| Insurance reserve for employee medical benefit program     | $ 1,451               |

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| - References
No definition available.
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| - Definition
Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| - Definition
Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.
+ References
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