Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity Rollforward (Details)

v3.19.1
Shareholders' Equity Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
As of beginning balance $ 447,355 $ 221,639 $ 221,639
Net income (loss) (38,697) 10,295  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (94) [1] (2,659) [2]  
All Other Changes 380 989 [3]  
As of ending balance 408,944 230,264 447,355
Share-based compensation 1,038 1,576  
Common Stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
As of beginning balance 151 150 150
All Other Changes 0 1  
As of ending balance 151 151 151
Paid-in Capital      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
As of beginning balance 197,630 194,123 194,123
All Other Changes 381 [4] 988 [3]  
As of ending balance 198,011 195,111 197,630
Retained Earnings      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
As of beginning balance 249,492 27,366 27,366
Net income (loss) (38,697) 10,295  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (94) [1] (2,659) [2]  
All Other Changes 0 0  
As of ending balance 210,701 35,002 249,492
Accumulated Other Comprehensive Income      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
As of beginning balance 82 0 0
All Other Changes     (1)
As of ending balance $ 81 $ 0 $ 82
Time Vested Restricted Stock Units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Shares, Issued 24,657 37,845  
Performance Restricted Stock Units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Shares, Issued 1,495 1,495  
[1] to the adoption of ASC Topic 842 as of January 1, 2019 (see Note 9).
[2] 1 Reflects a write-off 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, Revenues from Contracts with Customers.
[3] Includes equity-classified share-based compensation of $1.6 million during the three months ended March 31, 2018. During the three months ended March 31, 2018, 37,845 and 1,495 shares of common stock were issued in connection with the vesting of certain RSUs and performance restricted stock units (“PRSUs”), net of shares withheld for income taxes, respectively.
[4] Includes equity-classified share-based compensation of $1.0 million during the three months ended March 31, 2019. During the three months ended March 31, 2019, 24,657 shares of common stock were issued in connection with the vesting of certain time-vested restricted stock units (“RSUs”), net of shares withheld for income taxes.