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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2019
Accounting Policies [Abstract] |
Disaggregation of Revenue | The following table disaggregates the Company’s non-regulated revenue by source for the three months ended March 31, 2019 and 2018:
| Three Months Ended March 31
| 2019 |  | 2018
Operating and maintenance revenue | $ | 3,046 |  |  | $ | 3,165 |
Other non-regulated revenue | 1,296 |  |  | 743 |
Non-regulated revenue from contracts with customers | $ | 4,342 |  |  | $ | 3,908 |
Lease revenue | $ | 559 |  |  | $ | 511 |
Total non-regulated revenue | $ | 4,901 |  |  | $ | 4,419 |
In the following table, revenue from contracts with customers is disaggregated by class of customers for the three months ended March 31, 2019 and 2018:
| Three Months Ended March 31
| 2019 |  | 2018
Residential | $ | 84,259 |  |  | $ | 91,319 |
Business | 25,481 |  |  | 27,057 |
Industrial | 7,264 |  |  | 7,579 |
Public authorities | 4,471 |  |  | 5,444 |
Other (a) | (4,065 | ) |  | 2,855 |
Total revenue from contracts with customers | $ | 117,410 |  |  | $ | 134,254 |
(a) Other includes the accrued unbilled revenue.
The following table disaggregates the Company’s operating revenue by source for the three months ended March 31, 2019 and 2018:
| Three Months Ended March 31
| 2019 |  | 2018
Revenue from contracts with customers | $ | 117,410 |  |  | $ | 134,254 |
Regulatory balancing account revenue | 8,701 |  |  | 299 |
Total operating revenue | $ | 126,111 |  |  | $ | 134,553 |
Schedule of Cash, Cash Equivalents, and Restricted Cash | The following table provides a reconciliation of cash, cash equivalents, and restricted cash within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown on the Condensed Consolidated Statements of Cash Flows:
| March 31, 2019 |  | December 31, 2018
Cash and cash equivalents | 60,234 |  |  | 47,176 |
Restricted cash (included in "taxes, prepaid expenses and other assets") | 656 |  |  | 539 |
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows | $ | 60,890 |  |  | $ | 47,715 |
Maturities of lease liabilities | Maturities of lease payments to be received are as follows:
Year Ending December 31, | Operating Leases
2019 | $ | 3,032 |
2020 | 2,482 |
2021 | 1,809 |
2022 | 1,013 |
2023 | 534 |
Thereafter | 828 |
Maturities of lease liabilities are as follows:
Year Ending December 31, | Operating Leases |  | Finance Leases
2019 (a) | $ | 1,304 |  |  | $ | 1,139 |
2020 | 1,760 |  |  | 1,216 |
2021 | 1,538 |  |  | 1,217 |
2022 | 1,410 |  |  | 1,217 |
2023 | 1,319 |  |  | 1,735 |
Thereafter | 10,764 |  |  | 3,217 |
Total lease payments | $ | 18,095 |  |  | $ | 9,741 |
Less imputed interest | $ | (3,983 | ) |  | $ | (3,092 | )
Total | $ | 14,112 |  |  | $ | 6,649 |
(a) Excludes payments made for the first three months of 2019.

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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