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Commitments And Contingencies (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 27, 2019
Other Commitments [Line Items] |  |  |  |
Rent expense | $ 6,175,000 | $ 8,095,000 | $ 7,091,000 |
Purchase obligations | $ 114,396,000 | $ 119,960,000 |  |
Management |  |  |  |
Other Commitments [Line Items] |  |  |  |
Duration of employment agreement | 3 years |  |  |
Subsequent Event |  |  |  |
Other Commitments [Line Items] |  |  |  |
Estimated litigation liability |  |  |  | $ 0

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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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