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Description of Business and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
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.