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Consolidated Statement of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Divestiture [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Divestiture [Member]
Treasury Stock [Member]
CECO
CECO
Divestiture [Member]
Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2015 $ 245,021   $ 340 $ 243,274 $ 5,472 $ (9,577)   $ (356) $ 239,153   $ 5,868
Beginning Balance, Shares at Dec. 31, 2015     34,056         (138)      
Net loss (38,254)       (38,218)       (38,218)   (36)
Common stock dividends (8,995)       (8,995)       (8,995)    
Exercise of stock options and dividend reinvestment issuances $ 1,515   $ 2 1,513         1,515    
Exercise of stock options and dividend reinvestment issuances, Shares 195   215                
Excess tax benefit from stock options exercised $ 137     137         137    
Restricted stock units issued (9)     (9)         (9)    
Restricted stock units issued, Shares     17                
Share based compensation earned 2,458   $ 1 2,457         2,458    
Share based compensation earned, Shares     27                
Issuance of shares for cashless warrant exercise     $ 1 (1)              
Issuance of shares for cashless warrant exercise, Shares     90                
Stock repurchase and retirement (1,238)   $ (1) (1,237)         (1,238)    
Stock repurchase and retirement, Shares     (105)                
Noncontrolling interest acquisition (7,088)     (1,256)         (1,256)   $ (5,832)
Adjustment for minimum pension liability, net of tax 87         87     87    
Interest rate swap 312         312     312    
Translation income (loss) (3,864)         (3,864)     (3,864)    
Ending Balance at Dec. 31, 2016 190,082   $ 343 244,878 (41,741) (13,042)   $ (356) 190,082    
Ending Balance, Shares at Dec. 31, 2016     34,300         (138)      
Translation (loss) gain, beginning balance at Dec. 31, 2015 (4,407)                    
Translation (loss) gain, ending balance at Dec. 31, 2016 (8,271)                    
Minimum pension liability adjustment beginning balance at Dec. 31, 2015 (5,170)                    
Minimum pension liability adjustment, ending balance at Dec. 31, 2016 (5,083)                    
Accumulated other comprehensive loss, beginning balance at Dec. 31, 2015 (9,577)                    
Accumulated other comprehensive loss, activity (3,465)                    
Accumulated other comprehensive loss, ending balance at Dec. 31, 2016 (13,042)                    
Interest rate swap adjustment ending balance at Dec. 31, 2016 312                    
Net loss (3,029)       (3,029)       (3,029)    
Cumulative effect adjustment | ASU 2016-09 [Member] 66     177 (111)       66    
Common stock dividends (7,792)       (7,792)       (7,792)    
Exercise of stock options and dividend reinvestment issuances $ 1,295   $ 3 1,292         1,295    
Exercise of stock options and dividend reinvestment issuances, Shares 292   291                
Restricted stock units issued $ (135)   $ 1 (136)         (135)    
Restricted stock units issued, Shares     92                
Share based compensation earned 1,959     1,959         1,959    
Share based compensation earned, Shares     25                
Adjustment for minimum pension liability, net of tax (78)         (78)     (78)    
Interest rate swap 180         180     180    
Translation income (loss) 4,021         4,021     4,021    
Ending Balance at Dec. 31, 2017 186,569   $ 347 248,170 (52,673) (8,919)   $ (356) 186,569    
Ending Balance, Shares at Dec. 31, 2017     34,708         (138)      
Translation (loss) gain, ending balance at Dec. 31, 2017 (4,250)                    
Minimum pension liability adjustment, ending balance at Dec. 31, 2017 (5,161)                    
Accumulated other comprehensive loss, activity 4,123                    
Accumulated other comprehensive loss, ending balance at Dec. 31, 2017 (8,919)                    
Interest rate swap adjustment ending balance at Dec. 31, 2017 492                    
Net loss (7,121)       (7,121)       (7,121)    
Cumulative effect adjustment | ASU 2018-02 [Member] (30)       1,037 (1,067)     (30)    
Cumulative effect adjustment | ASU 2014-09 [Member] (622)       (622)       (622)    
Cumulative translation adjustment for divestiture   $ 375         $ 375     $ 375  
Translation (loss) gain, cumulative translation adjustment   375                  
Minimum pension liability adjustment, cumulative translation adjustment | ASU 2018-02 [Member] (1,062)                    
Accumulated other comprehensive loss, cumulative translation adjustment   $ 375                  
Accumulated other comprehensive loss, cumulative translation adjustment | ASU 2018-02 [Member] (1,067)                    
Adjustment for interest rate swap, net of tax | ASU 2018-02 [Member] (5)                    
Exercise of stock options and dividend reinvestment issuances $ 89     89         89    
Exercise of stock options and dividend reinvestment issuances, Shares 16   16                
Restricted stock units issued $ (253)   $ 2 (207) 48       (253)    
Restricted stock units issued, Shares     192                
Share based compensation earned 3,357     3,357         3,357    
Share based compensation earned, Shares     38                
Adjustment for minimum pension liability, net of tax (22)         (22)     (22)    
Interest rate swap 76         76     76    
Translation income (loss) (3,858)         (3,858)     (3,858)    
Ending Balance at Dec. 31, 2018 178,560   $ 349 $ 251,409 $ (59,427) $ (13,415)   $ (356) $ 178,560    
Ending Balance, Shares at Dec. 31, 2018     34,954         (138)      
Translation (loss) gain, ending balance at Dec. 31, 2018 (7,733)                    
Minimum pension liability adjustment, ending balance at Dec. 31, 2018 (6,245)                    
Accumulated other comprehensive loss, activity (3,804)                    
Accumulated other comprehensive loss, ending balance at Dec. 31, 2018 (13,415)                    
Interest rate swap adjustment ending balance at Dec. 31, 2018 $ 563