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Consolidated Statements of Stockholder's Equity Consolidated Statements of Stockholder's Equity - USD ($)
shares in Thousands, $ in Thousands
Total
AOCI Attributable to Parent [Member]
Common Stock [Member]
Retained Earnings [Member]
Additional Paid-in Capital [Member]
Shares, Outstanding     16,448    
Stockholders' Equity Attributable to Parent $ 575,434 $ (43,983) $ 2 $ 618,254 $ 1,161
Net Income (Loss) Attributable to Parent 2,600     2,600  
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture     13    
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture 1,267       1,267
Reclassification of the income tax effects of the Tax Cuts and Jobs Act   (12,852)   12,852  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (1,419) 1,419      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent   507      
Net Income (Loss) Attributable to Parent 9,561        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (3,372)        
Shares, Outstanding     16,461    
Stockholders' Equity Attributable to Parent 580,720 (55,416) $ 2 633,706 2,428
Net Income (Loss) Attributable to Parent 6,961     6,961  
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture     0    
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture 1,552       1,552
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (1,644)        
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (1,336) 1,336      
Shares, Outstanding     16,461    
Stockholders' Equity Attributable to Parent 590,569 (54,080) $ 2 640,667 3,980
Shares, Outstanding     16,482    
Stockholders' Equity Attributable to Parent 426,396 (67,348) $ 2 487,339 6,403
Net Income (Loss) Attributable to Parent 3,837     3,837  
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture     33    
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture 772       772
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (1,239) 1,239      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent   442      
Net Income (Loss) Attributable to Parent 3,413        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (2,573)        
Shares, Outstanding     16,515    
Stockholders' Equity Attributable to Parent 432,244 (66,109) $ 2 491,176 7,175
Net Income (Loss) Attributable to Parent (424)     (424)  
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture     0    
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture 1,211       1,211
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (1,334) (1,334)      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (1,334)        
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent   475      
Shares, Outstanding     16,515    
Stockholders' Equity Attributable to Parent $ 434,365 $ (64,775) $ 2 $ 490,752 $ 8,386