Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity Rollforward (Details)

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Shareholders' Equity Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
As of beginning balance $ 228,612 $ 230,264 $ 221,639 $ 236,696 $ 214,464 $ 185,548 $ 221,639 $ 185,548
Net income (loss) 16,276 (2,521) 10,295 (5,947) 21,329 28,081 24,050 43,463
All Other Changes 1,020 869 (1,670) 1,013 903 835    
As of ending balance 245,908 228,612 230,264 231,762 236,696 214,464 245,908 231,762
Share-based compensation 1,000     1,000     3,472 2,707
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification             2,700  
Common Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
As of beginning balance 151 151 150 150 150 150 150 150
All Other Changes 0 0 1 0 0 0    
As of ending balance 151 151 151 150 150 150 151 150
Paid-in Capital                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
As of beginning balance 195,980 195,111 194,123 192,359 191,456 190,621 194,123 190,621
All Other Changes 1,020 [1] 869 [1] 988 [1] 1,013 [2] 903 [2] 835 [2]    
As of ending balance 197,000 195,980 195,111 193,372 192,359 191,456 197,000 193,372
Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
As of beginning balance 32,481 35,002 27,366 44,114 22,785 (5,296) 27,366 (5,296)
Net income (loss) 16,276 (2,521) 10,295 (5,947) 21,329 28,081    
All Other Changes 0 0 (2,659) [1] 0 0 0    
As of ending balance 48,757 32,481 35,002 38,167 44,114 22,785 48,757 38,167
Accumulated Other Comprehensive Income                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
As of beginning balance 0 0 0 73 73 73 0 73
As of ending balance $ 0 $ 0 $ 0 $ 73 $ 73 $ 73 $ 0 $ 73
Time Vested Restricted Stock Units [Member]                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shares, Issued 53,411     12,252     53,411 12,252
Performance Restricted Stock Units [Member]                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shares, Issued 1,495           1,495  
[1] Includes equity-classified share-based compensation of $3.5 million during the nine months ended September 30, 2018. During the nine months ended September 30, 2018, 53,411 and 1,495 shares of common stock were issued in connection with the vesting of certain time-vested restricted stock units (“RSUs”) and performance restricted stock units (“PRSUs”), net of shares withheld for income taxes, respectively. This also includes a write-off of $2.7 million for certain accounts receivable attributable to natural gas imbalances accounted for under the entitlements method prior to January 1, 2018, in connection with the adoption of ASC Topic 606 (see Note 5).
[2] 1 Includes equity-classified share-based compensation of $2.7 million during the nine months ended September 30, 2017 and $0.1 million from the receipt in May 2017 of proceeds attributable to the rights offering in 2016 that had been held in escrow, net of costs to register our common stock. During the nine months ended September 30, 2017, 12,252 shares of common stock were issued in connection with vesting of certain RSUs, net of shares withheld for income taxes.