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Schedule II - Valuation And Qualifying Accounts And Reserves | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts and Reserves |
Year Ended December 31, |  |  | Additions |  |  |  |
Description |  | Balance at Beginning of Year |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | (Deductions) |  | Balance at End of Year
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |
2017 |  | $ | 523 |  |  | $ | 172 |  |  | $ | — |  |  | $ | — |  |  | $ | 695 |
2016 |  | 649 |  |  | — |  |  | — |  |  | (126 | ) |  | 523 |
2015 |  | 784 |  |  | — |  |  | — |  |  | (135 | ) |  | 649 |
Deferred income tax valuation allowance: |  |  |  |  |  |  |  |  |  |
2017 (1) |  | $ | 17,922 |  |  | $ | — |  |  | $ | 50,547 |  |  | $ | — |  |  | $ | 68,469 |
2016 |  | 14,548 |  |  | — |  |  | 3,374 |  |  | — |  |  | 17,922 |
2015 |  | 16,509 |  |  | (1,142 | ) |  | (819 | ) |  | — |  |  | 14,548 |
(1) Additions to deferred income tax valuation allowance in 2017 reflect the Pennsylvania state tax law change in October 2017 regarding the use of net operating losses.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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