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General - Schedule of Major Streams of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Revenue from contracts with customers | $ 120,007 | $ 125,722 | $ 294,319 | $ 290,146
Alternative revenue programs, net - WCMA | 4,193 | 1,333 | 7,794 | 11,248
Other balancing and memorandum accounts revenue, net | (788) | (3,868) | (7,235) | (9,979)
Rental income | 1,441 | 1,391 | 4,103 | 4,281
Total revenues | 124,853 | $ 124,578 | 298,981 | $ 295,696
Reduction of revenue related to cost-recovery balancing accounts | $ 2,527 |  | $ 3,556 |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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