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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]
Treasury stock reserved for contractual obligations
Accumulated other comprehensive income (loss) [Member]
Parent [Member]
Noncontrolling interest [Member]
Balance, Beginning at Dec. 31, 2014 $ 524,970 $ 0 $ 513,090 $ 132,111 $ (13,897) $ (1,075) $ (112,630) $ 517,599 $ 7,371
Balance, Beginning (in shares) at Dec. 31, 2014   53,749,028              
Net loss (89,828)     (75,174)       (75,174) (7,640)
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest (82,814)                
CTA, net of tax (79,196)           (74,459) (74,459) (65)
Temporary Equity, Foreign Currency Translation Adjustments (74,524)                
Pension liability adjustments, net of tax (662)           (662) (662)  
Dividends declared (1,077)     (1,077)       (1,077)  
Note conversion 0                
Restricted stock awards 0   (777)   777     0  
Restricted stock awards (in shares)   86,500              
Exercise of stock options 145   33   112     145  
Exercise of stock options (in shares)   12,500              
Dissolution of subsidiary (42)         0 (42)
Redemption value adjustment (17,668)   (17,668)         (17,668)
Stock-based compensation 2,335   2,335         2,335  
Issuance of treasury stock under 401(k) plan 583   (5)   588     583  
Issuance of treasury stock under 401(k) plan (in shares)   65,481              
Balance, Ending at Dec. 31, 2015 351,246   497,008 55,860 (12,420) (1,075) (187,751) 351,622 (376)
Balance, Ending (in shares) at Dec. 31, 2015   53,913,509              
Income attributable to redeemable noncontrolling interest (7,014)                
Currency translation (4,672)                
Net loss (39,755)     (37,605)       (37,605) (4,346)
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest (41,951)                
CTA, net of tax 5,857           1,893 1,893 119
Temporary Equity, Foreign Currency Translation Adjustments 2,012                
Pension liability adjustments, net of tax 1,071           1,071 1,071  
Dividends declared (1,081)     (1,081)       (1,081)  
Note conversion 0                
Restricted stock awards 0   (1,463)   1,463     0  
Restricted stock awards (in shares)   162,880              
Stock Issued During Period, Value, Acquisitions (12,039)   (8,548) 40     (3,491) (11,999) (40)
Redemption value adjustment (9,556)   (9,556)         (9,556)  
Stock-based compensation 1,954   1,954         1,954  
Variable Interest Entity, Members Draw 705         0 705
Issuance of treasury stock under 401(k) plan 518   (320)   838     518  
Issuance of treasury stock under 401(k) plan (in shares)   93,491              
Balance, Ending at Dec. 31, 2016 292,879 $ 0 479,075 17,214 (10,119) (1,075) (188,278) 296,817 (3,938)
Balance, Ending (in shares) at Dec. 31, 2016   54,169,880              
Income attributable to redeemable noncontrolling interest 2,196                
Currency translation 3,844                
Net loss (64,079)     (60,042)       (60,042) (4,121)
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest (64,163)                
CTA, net of tax 30,818           29,679 29,679 (768)
Temporary Equity, Foreign Currency Translation Adjustments 28,911                
Pension liability adjustments, net of tax 1,523           1,523 1,523  
Dividends declared (1,194)     (1,194)       (1,194)  
Note conversion, Shares   5,462,264              
Note conversion 58,460   58,460         58,460  
Restricted stock awards $ 0   (1,071)   1,071     0  
Restricted stock awards (in shares)   119,173              
Exercise of stock options (in shares) 0                
Redemption value adjustment $ (6,393)   (6,393)         (6,393)
Stock-based compensation 1,539   1,539         1,539  
Variable Interest Entity, Members Draw (2,018)             0 (2,018)
Issuance of treasury stock under 401(k) plan 540   98   442     540  
Issuance of treasury stock under 401(k) plan (in shares)   49,242              
Balance, Ending at Dec. 31, 2017 310,084 $ 0 $ 531,708 $ (44,022) $ (8,606) $ (1,075) $ (157,076) $ 320,929 $ (10,845)
Balance, Ending (in shares) at Dec. 31, 2017   59,800,559              
Income attributable to redeemable noncontrolling interest 84                
Currency translation $ 1,907