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Description of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Description of Business and Summary of Significant Accounting Policies [Abstract] |
Schedule of antidilutive shares excluded from computation of earnings per share |
|  | Year ended December 31,
(in thousands) |  | 2015 |  | 2014 |  | 2013
Stock options |  | 414 |  | 438 |  | 3,443
Non-vested restricted Class B common stock |  | 1,852 |  | 2,473 |  | 265
Shares excluded from the calculation of diluted earnings per share |  | 2,266 |  | 2,911 |  | 3,708
Summary of concentration risk percentage of consolidated revenues and consolidated gross trade accounts receivable from utility companies |
|  | Year ended December 31,
|  | 2015 |  | 2014 |  | 2013
Con Edison |  | 23 | % |  | 23 | % |  | 25 | %
National Grid USA |  | 12 | % |  | na |  |  | 10 | %
West Penn Power |  | na |  |  | 10 | % |  | 11 | %
Penelec |  | na |  |  | na |  |  | 10 | %
na-less than 10% of consolidated revenue in the period
December 31 |  | 2015 |  | 2014
Con Edison |  | 22 | % |  | 25 | %
Change in the allowance for doubtful accounts |
(in thousands) |  | Balance at beginning of period |  | Additions charged (reversals credited) to expense |  | Deductions(1) |  | Balance at end of period
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 227 |  | $ | (29 | ) |  | $ | (16 | ) |  | $ | 182
Year ended December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 930 |  | $ | 310 |  |  | $ | (1,013 | ) |  | $ | 227
Year ended December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 130 |  | $ | 800 |  |  | $ | — |  |  | $ | 930
____________ (1) Uncollectible accounts written off.

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6442-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6327-108592 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 + Details
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