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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2017 $ 321,809 $ 279 $ 128,419 $ 222,974 $ (22,539) $ (7,324)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 3,203 0 0 3,203 0 0
Other comprehensive income (loss) 826 0 0 0 0 826
Treasury shares sold to Employee Stock Purchase Plan (224) 0 110 0 (334) 0
Issuance of deferred shares 0 0 (4,467) 0 4,467 0
Other Treasury Share Purchases (627) 0 0 0 (627) 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2018 331,923 279 130,330 226,177 (18,365) (6,498)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 6,488 0 6,488 0 0 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2017 335,586 279 128,235 231,330 (18,470) (5,788)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (5,153) 0 0 (5,153) 0 0
Other comprehensive income (loss) (710) 0 0 0 0 (710)
Treasury shares sold to Employee Stock Purchase Plan 82 0 1 0 81 0
Issuance of deferred shares 0 0 (39) 0 39 0
Other Treasury Share Purchases (15) 0 0 0 (15) 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2018 331,923 279 130,330 226,177 (18,365) (6,498)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 2,133 0 2,133 0 0 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2018 318,843 279 132,198 211,494 (17,717) (7,411)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 15,170 0   15,170    
Other comprehensive income (loss) (452) 0 0 0 0 (452)
Open market purchases of treasury shares 5,190 0 0 0 5,190 0
Treasury shares sold to Employee Stock Purchase Plan 235 0 25 0 210 0
Exercise of stock options 128 0 (126) 0 254 0
Issuance of deferred shares 0 0 (6,306) 0 6,306 0
Other Treasury Share Purchases (1,685) 0 0 0 (1,685) 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2019 336,094 279 134,836 226,664 (17,822) (7,863)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 9,045 0 9,045 0 0 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2018 323,590 279 131,889 217,731 (18,230) (8,079)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 8,933 0 0 8,933 0 0
Other comprehensive income (loss) 216 0 0 0 0 216
Treasury shares sold to Employee Stock Purchase Plan 82 0 6 0 76 0
Issuance of deferred shares 0 0 (366) 0 366 0
Other Treasury Share Purchases (34) 0 0 0 (34) 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2019 336,094 279 134,836 226,664 (17,822) (7,863)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense $ 3,307 $ 0 $ 3,307 $ 0 $ 0 $ 0