Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity Rollforward (Details)

v3.19.3
Shareholders' Equity Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
As of beginning balance $ 461,554 $ 447,355 $ 228,612 $ 221,639 $ 447,355 $ 221,639 $ 447,355 $ 221,639
Net income (loss) 54,362 (38,697) 16,276 10,295 51,625 (2,521) 67,290 24,050
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   (94)   (2,659)        
All Other Changes 742 380 1,020 989 985 869    
As of ending balance 516,658 408,944 245,908 230,264 461,554 228,612 516,658 245,908
Share-based compensation 1,000   1,000       3,101 3,472
Common Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
As of beginning balance 151 151 151 150 151 150 151 150
All Other Changes 0 0 1 0 0    
As of ending balance 151 151 151 151 151 151 151 151
Paid-in Capital                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
As of beginning balance 198,997 197,630 195,980 194,123 197,630 194,123 197,630 194,123
All Other Changes 742 381 1,020 988 986 869    
As of ending balance 199,739 198,011 197,000 195,111 198,997 195,980 199,739 197,000
Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
As of beginning balance 262,326 249,492 32,481 27,366 249,492 27,366 249,492 27,366
Net income (loss) 54,362 (38,697) 16,276 10,295 51,625 (2,521)    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   (94)   (2,659)        
All Other Changes 0 0 0 0 0    
As of ending balance 316,688 210,701 48,757 35,002 262,326 32,481 316,688 48,757
Accumulated Other Comprehensive Income                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
As of beginning balance 80 82 0 0 82 0 82 0
All Other Changes   (1)     (1)      
As of ending balance $ 80 $ 81 $ 0 $ 0 $ 80 $ 0 $ 80 $ 0
Time Vested Restricted Stock Units [Member]                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shares, Issued 42,534   53,411       42,534 53,411
Performance Restricted Stock Units [Member]                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shares, Issued 1,495   1,495       1,495 1,495