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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - 6 months ended Jun. 30, 2017 - 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]
Variable Interest Entity, Members Draw $ (979)           $ 0 $ (979)
Balance, Beginning (in shares) at Dec. 31, 2016   54,169,880              
Balance, Beginning at Dec. 31, 2016 292,879   479,075 $ 17,214 $ (10,119) $ (1,075) $ (188,278) 296,817 (3,938)
Net income (loss) (17,122)     (17,746)       (17,746)  
Currency translation adjustment 19,025           18,428 18,428  
Pension liability adjustments, net of tax 1,722           1,722 1,722  
Dividends (596)     (596)       (596)  
Stockholders' Equity, Other 58,460                
Noncontrolling Interest, Period Increase (Decrease) 0                
Noncontrolling Interest, Change in Redemption Value 3,099   (3,099)         (3,099)  
Stock-based compensation 956   956         956  
Issuance of treasury stock under 401(k) plan (in shares)   25,196              
Issuance of treasury stock under 401(k) plan 270   44   226     270  
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest (16,932)               814
Temporary Equity, Foreign Currency Translation Adjustments $ 17,904               (524)
Balance, Ending (in shares) at Jun. 30, 2017 59,657,340 59,657,340              
Balance, Ending at Jun. 30, 2017 $ 350,585   $ 535,436 $ (1,128) $ (9,893) $ (1,075) $ (168,128) $ 355,212 $ (4,627)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest (190)                
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest $ 1,121