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Intangible Assets, Net and Goodwill (Schedule of Identifiable Intangible Assets) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of Identifiable Intangible Assets [Line Items] |  |  |
Amortization expense | $ 2,980,000 | $ 3,883,000 | $ 5,146,000
Gross carrying amount | 37,198,000 | 37,198,000 |
Accumulated amortization | (26,044,000) | (23,064,000) |
Net carrying amount | 11,154,000 | 14,134,000 |
Intangible assets not subject to amortization | 115,421,000 | 115,421,000 |
Intangible assets, net | 126,575,000 | 129,555,000 |
Patents And Purchased Technology [Member] |  |  |
Summary of Identifiable Intangible Assets [Line Items] |  |  |
Gross carrying amount | 14,198,000 | 14,198,000 |
Accumulated amortization | (11,981,000) | (10,651,000) |
Customer Relationships [Member] |  |  |
Summary of Identifiable Intangible Assets [Line Items] |  |  |
Gross carrying amount | 23,000,000 | 23,000,000 |
Accumulated amortization | $ (14,063,000) | $ (12,413,000) |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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