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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2017 $ 192,951 $ 1,370 $ 216,006 $ 291 $ (24,716)
Balance, shares at Dec. 31, 2017   136,996,000      
Common stock issued (Note 3) 137,250 $ 153 137,097    
Common stock issued, shares   15,250,000      
Restricted stock issued and vesting of restricted stock units, net   $ 7 (7)    
Restricted stock issued and vesting of restricted stock units net, shares   825,000      
Shares repurchased (1,006)   (1,006)    
Shares repurchased, shares   (87,000)      
Exercise of stock options, net 139 $ 1 138    
Exercise of stock options net, shares   158,000      
Stock-based compensation 6,838   6,838    
Other comprehensive loss 170     170  
Dividends (9,167)       (9,167)
Net income 26,148       26,148
Balance at Jun. 30, 2018 353,323 $ 1,531 359,066 461 (7,735)
Balance, shares at Jun. 30, 2018   153,142,000      
Balance at Mar. 31, 2018 201,605 $ 1,378 218,488 1,163 (19,424)
Balance, shares at Mar. 31, 2018   137,751,000      
Common stock issued (Note 3) 137,250 $ 153 137,097    
Common stock issued, shares   15,250,000      
Restricted stock issued and vesting of restricted stock units net, shares   158,000      
Shares repurchased (272)   (272)    
Shares repurchased, shares   (27,000)      
Exercise of stock options, net 85   85    
Exercise of stock options net, shares   10,000      
Stock-based compensation 3,529   3,529    
Reclassification of stock issuance costs to temporary equity 139   139    
Other comprehensive loss (702)     (702)  
Dividends (5,035)       (5,035)
Net income 16,724       16,724
Balance at Jun. 30, 2018 353,323 $ 1,531 359,066 461 (7,735)
Balance, shares at Jun. 30, 2018   153,142,000      
Balance at Dec. 31, 2018 $ 358,335 $ 1,532 363,655 467 (7,319)
Balance, shares at Dec. 31, 2018 153,202,000 153,202,000      
Restricted stock issued and vesting of restricted stock units, net   $ 21 (21)    
Restricted stock issued and vesting of restricted stock units net, shares   2,211,000      
Shares repurchased $ (2,107) $ (2) (2,105)    
Shares repurchased, shares   (325,000)      
Exercise of stock options, net 14   14    
Exercise of stock options net, shares   20,000      
Stock-based compensation 6,207   6,207    
Other comprehensive loss 258     258  
Dividends (10,191)       (10,191)
Net income 11,303       11,303
Balance at Jun. 30, 2019 $ 363,819 $ 1,551 367,750 725 (6,207)
Balance, shares at Jun. 30, 2019 155,108,000 155,108,000      
Balance at Mar. 31, 2019 $ 363,434 $ 1,551 364,717 758 (3,592)
Balance, shares at Mar. 31, 2019   155,056,000      
Restricted stock issued and vesting of restricted stock units net, shares   66,000      
Shares repurchased (102)   (102)    
Shares repurchased, shares   (14,000)      
Stock-based compensation 3,135   3,135    
Other comprehensive loss (33)     (33)  
Dividends (5,094)       (5,094)
Net income 2,479       2,479
Balance at Jun. 30, 2019 $ 363,819 $ 1,551 $ 367,750 $ 725 $ (6,207)
Balance, shares at Jun. 30, 2019 155,108,000 155,108,000