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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Treasury stock [Member]
Deferred Compensation, Share-based Payments [Member]
Accumulated other comprehensive income (loss) [Member]
Parent [Member]
Noncontrolling interest [Member]
Balance, Beginning (in shares) at Dec. 31, 2017   59,800,559              
Balance, Beginning at Dec. 31, 2017 $ (310,084)   $ (531,708) $ 44,022 $ 8,606 $ (1,075) $ 157,076 $ (320,929) $ 10,845
Net income 15,968     17,647       17,647  
Currency translation adjustment, net 8,062           7,423 7,423 291
Temporary Equity, Foreign Currency Translation Adjustments 7,714                
Pension liability adjustments, net of tax 883           883 883  
Dividends declared (299)     (299)       (299)  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 123     88       88 35
Noncontrolling Interest, Period Increase (Decrease) 0                
Redemption value adjustment 2,343   (2,343)         (2,343)  
Stock-based compensation 73   73         73  
VIE distributions 476             0 476
Issuance of treasury stock under 401(k) plan   10,211              
Issuance of treasury stock under 401(k) plan (133)   (42)   (91)     (133)  
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest 16,483               (1,164)
Balance, Ending (in shares) at Mar. 31, 2018   59,810,770              
Balance, Ending at Mar. 31, 2018 (333,327)   (529,480) 26,586 8,515 (1,075) 148,770 (344,534) 11,207
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest (515)                
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest 348                
Balance, Beginning (in shares) at Dec. 31, 2018   59,916,973              
Balance, Beginning at Dec. 31, 2018 (270,097)   (519,498) 29,048 7,831 0 203,571 (279,048) 8,951
Net income 1,007     1,977       1,977  
Currency translation adjustment, net (4,379)           (5,281) (5,281) 474
Temporary Equity, Foreign Currency Translation Adjustments (4,807)                
Pension liability adjustments, net of tax 466           466 466  
Dividends declared (301)     (301)       (301)  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (587)     4,346     (4,933) (587)
Noncontrolling Interest, Period Increase (Decrease) (49,883)   9,437     9,437 15,445
Stock Issued During Period, Value, Acquisitions (24,882)                
Redemption value adjustment 776   (776)         (776)  
Stock-based compensation 269   269       269  
VIE distributions (1,054)             0 (1,054)
Issuance of treasury stock under 401(k) plan   29,414              
Issuance of treasury stock under 401(k) plan (141)   123   (264)     (141)  
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest 1,341               (636)
Balance, Ending (in shares) at Mar. 31, 2019   59,946,387              
Balance, Ending at Mar. 31, 2019 (289,671)   $ (528,305) $ 23,026 $ 7,567 $ 0 $ 213,319 $ (284,393) $ (5,278)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest (334)                
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest $ 428