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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT- Statements of Income and Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | $ 172,762 | $ 160,061 | [1] | $ 150,389 | [1]
Interest expense |  |  |  |  |  |  |  |  | 87,160 | 85,556 |  | 89,443 |
Income before income taxes |  |  |  |  |  |  |  |  | 261,922 | 247,747 |  | 217,407 |
Income tax benefits |  |  |  |  |  |  |  |  | (91,712) | (84,341) |  | (76,859) |
Net income | $ 33,630 | $ 48,286 | $ 41,894 | $ 46,400 | $ 39,486 | $ 48,707 | $ 41,061 | $ 34,152 | 170,210 | 163,406 | [1] | 140,548 | [1]
Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 303 | 288 |  | 221 |
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | 188,534 | 180,359 |  | 157,883 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Operating, administrative and general |  |  |  |  |  |  |  |  | 20,921 | 16,063 |  | 16,191 |
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 575 | 596 |  | 672 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 469 | 497 |  | 421 |
Interest expense |  |  |  |  |  |  |  |  | 11,599 | 16,207 |  | 16,695 |
Income before income taxes |  |  |  |  |  |  |  |  | 155,273 | 147,284 |  | 124,125 |
Income tax benefits |  |  |  |  |  |  |  |  | 13,047 | 14,232 |  | 14,533 |
Net income |  |  |  |  |  |  |  |  | $ 168,320 | $ 161,516 |  | $ 138,658 |
[1] | As restated - See Note 1, “Summary of significant accounting policies - Revision and restatements of previously issued financial statements.”

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