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Pension and Other Post Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2014
Pension and Other Postretirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
                    Other 
                    Postretirement 
 Pension Benefits  Benefits 
 2014  2013 2014 2013 
  Foreign  Domestic  Total  Foreign  Domestic  Total  Domestic  Domestic 
Change in benefit obligation                        
Benefit obligation at beginning of year$85,745 $66,369 $152,114 $81,280 $70,407 $151,687 $5,639 $7,317 
Service cost 2,626  250  2,876  2,864  299  3,163  19  34 
Interest cost 3,210  2,823  6,033  3,150  2,437  5,587  232  185 
Employee contributions 89  0  89  111  0  111  0  0 
Effect of plan amendments 242  0  242  (2,138)  0  (2,138)  0  0 
Benefits paid (1,985)  (4,589)  (6,574)  (1,853)  (4,516)  (6,369)  (533)  (566) 
Plan expenses and premiums paid (361)  (250)  (611)  (367)  (225)  (592)  0  0 
Transfer in of business acquisition 2,818  0  2,818  0  0  0  0  0 
Actuarial loss (gain) 26,412  6,064  32,476  (566)  (2,033)  (2,599)  688  (1,331) 
Translation differences and other (11,969)  0  (11,969)  3,264  0  3,264  0  0 
Benefit obligation at end of year$106,827 $70,667 $177,494 $85,745 $66,369 $152,114 $6,045 $5,639 
                         
Change in plan assets                        
Fair value of plan assets at beginning of                        
year$68,659 $50,650 $119,309 $60,909 $45,991 $106,900 $0 $0 
Actual return on plan assets 23,981  2,591  26,572  3,237  7,487  10,724  0  0 
Employer contributions 3,778  1,287  5,065  3,947  1,913  5,860  533  566 
Employee contributions 89  0  89  111  0  111  0  0 
Benefits paid (1,985)  (4,589)  (6,574)  (1,853)  (4,516)  (6,369)  (533)  (566) 
Plan expenses and premiums paid (361)  (250)  (611)  (367)  (225)  (592)  0  0 
Transfer in of business acquisition 2,093  0  2,093  0  0  0  0  0 
Translation differences (9,731)  0  (9,731)  2,675  0  2,675  0  0 
Fair value of plan assets at end of year$86,523 $49,689 $136,212 $68,659 $50,650 $119,309 $0 $0 
Net amount recognized$(20,304) $(20,978) $(41,282) $(17,086) $(15,719) $(32,805) $(6,045) $(5,639) 
Amounts recognized in the balance sheet                        
consist of:                        
Current liabilities$(94) $(577) $(671) $(242) $(589) $(831) $(568) $(607) 
Non-current liabilities (20,210)  (20,401)  (40,611)  (16,844)  (15,130)  (31,974)  (5,477)  (5,032) 
Net amount recognized$(20,304) $(20,978) $(41,282) $(17,086) $(15,719) $(32,805) $(6,045) $(5,639) 
Amounts not yet reflected in net periodic                        
benefit costs and included in                        
accumulated other comprehensive                        
loss:                        
Prior service credit (cost)$2,306 $(248) $2,058 $2,105 $(311) $1,794 $0 $0 
Accumulated loss (27,486)  (33,125)  (60,611)  (27,188)  (27,593)  (54,781)  (1,368)  (745) 
Accumulated other comprehensive                        
loss (AOCI) (25,180)  (33,373)  (58,553)  (25,083)  (27,904)  (52,987)  (1,368)  (745) 
Cumulative employer contributions                        
in excess of net period benefit cost 4,876  12,395  17,271  7,997  12,185  20,182  (4,677)  (4,894) 
Net amount recognized$(20,304) $(20,978) $(41,282) $(17,086) $(15,719) $(32,805) $(6,045) $(5,639) 
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
  2014  2013 
   Foreign  Domestic  Total  Foreign  Domestic  Total 
Projected benefit obligation$106,827 $70,667 $177,494 $85,745 $66,369 $152,114 
Accumulated benefit obligation 104,764  70,667  175,431  84,005  66,369  150,374 
Fair value of plan assets 86,523  49,689  136,212  68,659  50,650  119,309 
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
  2014  2013 
   Foreign  Domestic  Total  Foreign  Domestic  Total 
Projected benefit obligation$106,827 $70,667 $177,494 $85,745 $66,369 $152,114 
Fair value of plan assets 86,523  49,689  136,212  68,659  50,650  119,309 
Schedule of Net Benefit Costs [Table Text Block]
  2014  2013 
   Foreign  Domestic  Total  Foreign  Domestic  Total 
Service cost$2,626 $250 $2,876 $2,864 $299 $3,163 
Interest cost 3,210  2,823  6,033  3,150  2,437  5,587 
Expected return on plan assets (2,543)  (3,817)  (6,360)  (2,245)  (3,664)  (5,909) 
Actuarial loss amortization 1,307  1,757  3,064  1,486  2,481  3,967 
Prior service cost amortization 736  63  799  30  148  178 
Net periodic benefit cost$5,336 $1,076 $6,412 $5,285 $1,701 $6,986 

         2012    
         Foreign  Domestic  Total    
  Service cost $2,004 $460 $2,464    
  Interest cost  3,020  2,803  5,823    
  Expected return on plan assets  (1,995)  (3,481)  (5,476)    
  Actuarial loss amortization  590  2,057  2,647    
  Prior service cost amortization  30  82  112    
  Net periodic benefit cost $3,649 $1,921 $5,570    

    2014  2013  2012 
 Service cost$19 $34 $46 
 Interest cost 232  185  283 
 Actuarial loss amortization 65  32  115 
 Net periodic benefit costs$316 $251 $444 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
  2014  2013 
   Foreign  Domestic  Total  Foreign  Domestic  Total 
Net loss (gain) arising during the period$4,973 $7,290 $12,263 $(1,558) $(5,856) $(7,414) 
Effect of plan amendment 242  0  242  (2,138)  0  (2,138) 
Recognition of amortization in net periodic                  
 benefit cost                  
  Prior service cost (736)  (63)  (799)  (30)  (148)  (178) 
  Actuarial loss (1,307)  (1,757)  (3,064)  (1,486)  (2,481)  (3,967) 
Effect of exchange rates on amounts included in                  
 AOCI (3,076)  0  (3,076)  1,007  0  1,007 
Total recognized in other comprehensive                   
 loss (income)  96  5,470  5,566  (4,205)  (8,485)  (12,690) 
Total recognized in net periodic benefit cost and                  
 other comprehensive loss (income)$5,432 $6,546 $11,978 $1,080 $(6,784) $(5,704) 

     2012    
      Foreign  Domestic  Total    
 Net loss arising during period $13,897 $4,826 $18,723    
 Recognition of amortization in net periodic benefit cost             
  Prior service cost    (30)  (82)  (112)    
  Actuarial loss    (590)  (2,057)  (2,647)    
 Effect of exchange rates on amounts included in AOCI  809  0  809    
 Total recognized in other comprehensive loss  14,086  2,687  16,773    
 Total recognized in net periodic benefit cost and other             
  comprehensive loss $17,735 $4,608 $22,343    

    2014  2013  2012 
 Net loss (gain) arising during period$688 $(1,331) $514 
 Amortization of actuarial loss in net periodic benefit costs (65)  (32)  (115) 
 Total recognized in other comprehensive loss (income)  623  (1,363)  399 
 Total recognized in net periodic benefit cost and other         
  comprehensive loss (income)$939 $(1,112) $843 
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
   Pension Plans  Other Postretirement 
    Foreign  Domestic  Total  Benefits 
 Actuarial loss$1,231 $2,374 $3,605 $103 
 Prior service (credit) cost (179)  63  (116)  0 
  $1,052 $2,437 $3,489 $103 
Schedule of Assumptions Used [Table Text Block]
         Other Postretirement 
   Pension Benefits Benefits 
    2014  2013  2014  2013 
 U.S. Plans:            
 Discount rate 3.72%  4.48%  3.45%  4.05% 
 Rate of compensation increase 3.63%  3.63%  N/A  N/A 
               
 Foreign Plans:            
 Discount rate 2.51%  3.84%  N/A  N/A 
 Rate of compensation increase 3.05%  3.05%  N/A  N/A 

         Other Postretirement 
   Pension Benefits Benefits 
    2014  2013  2014  2013 
 U.S. Plans:            
 Discount rate 4.48%  3.52%  4.05%  3.20% 
 Expected long-term return on plan assets 7.85%  8.25%  N/A  N/A 
 Rate of compensation increase 3.63%  3.40%  N/A  N/A 
               
 Foreign Plans:            
 Discount rate 3.84%  3.94%  N/A  N/A 
 Expected long-term return on plan assets 3.67%  3.57%  N/A  N/A 
 Rate of compensation increase 3.05%  3.60%  N/A  N/A 
               

    2014  2013 
 Health care cost trend rate for next year 6.90%  7.10% 
 Rate to which the cost trend rate is assumed to decline (the      
  ultimate trend rate) 4.50%  4.50% 
 Year that the rate reaches the ultimate trend rate 2027  2027 
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
    1% point  1% point 
    Increase  Decrease 
 Effect on total service and interest cost$21 $(18) 
 Effect on postretirement benefit obligations 526  (460) 
Schedule of Allocation of Plan Assets [Table Text Block]
    Target  2014  2013 
 Asset Category         
 U.S. Plans         
 Equity securities 61%  66%  66% 
 Debt securities 32%  33%  32% 
 Other 7%  1%  2% 
  Total 100%  100%  100% 
            
 Foreign Plans         
 Equity securities and other 22%  22%  19% 
 Debt securities 78%  78%  81% 
  Total 100%  100%  100% 

      Fair Value Measurements at December 31, 2014
   Fair Value as of  Using Fair Value Hierarchy
U.S. Pension AssetsDecember 31, 2014 Level 1 Level 2 Level 3
Cash and cash equivalents$490 $490 $0 $0
Large capitalization common stock 14,956  14,956  0  0
Large capitalization registered investment companies 6,339  6,339  0  0
Small capitalization common stock 920  920  0  0
Small capitalization registered investment companies 2,416  2,416  0  0
International developed and emerging markets registered           
 investment companies 5,638  5,638  0  0
International developed and emerging markets common stock 2,600  2,600  0  0
Fixed income corporate securities 9,848  0  9,848  0
Fixed income registered investment companies 4,647  4,647  0  0
Fixed income U.S. and foreign government securities 406  0  406  0
Pooled separate accounts 1,429  0  1,429  0
 Total U.S. pension plan assets$49,689 $38,006 $11,683 $0
              
Foreign Pension Assets           
Cash and cash equivalents$76 $76 $0 $0
Insurance contract 72,417  0  0  72,417
Diversified equity securities - registered investment companies 6,565  0  6,565  0
Fixed income - foreign registered investment companies 4,946  0  4,946  0
Commingled funds 2,041  0  2,041  0
Real estate - registered investment companies 478  0  0  478
 Total foreign pension assets$86,523 $76 $13,552 $72,895
  Total pension assets at fair value$136,212 $38,082 $25,235 $72,895

      Fair Value Measurements at December 31, 2013
   Fair Value as of Using Fair Value Hierarchy
U.S. Pension AssetsDecember 31, 2013 Level 1 Level 2 Level 3
Cash and cash equivalents$825 $825 $0 $0
Large capitalization common stock 14,801  14,801  0  0
Large capitalization registered investment companies 6,820  6,820  0  0
Small capitalization common stock 771  771  0  0
Small capitalization registered investment companies 2,384  2,384  0  0
International developed and emerging markets registered           
 investment companies 5,895  5,895  0  0
International developed and emerging markets common stock 2,929  2,929  0  0
Fixed income corporate securities 10,144  0  10,144  0
Fixed income registered investment companies 4,486  4,486  0  0
Fixed income U.S. and foreign government securities 192  0  192  0
Pooled separate accounts 1,403  0  1,403  0
 Total U.S. pension plan assets$50,650 $38,911 $11,739 $0
              
Foreign Pension Assets           
Cash and cash equivalents$5 $5 $0 $0
Insurance contract 57,175  0  0  57,175
Diversified equity securities - registered investment companies 6,597  0  6,597  0
Fixed income - foreign registered investment companies 4,448  0  4,448  0
Real estate - registered investment companies 434  0  0  434
 Total foreign pension assets$68,659 $5 $11,045 $57,609
  Total pension assets at fair value$119,309 $38,916 $22,784 $57,609
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
     Insurance  Real Estate    
     Contract  Fund  Total 
 Balance at December 31, 2012 $51,146 $388 $51,534 
  Purchases  3,182  0  3,182 
  Settlements  (1,607)  0  (1,607) 
  Unrealized gains  2,061  36  2,097 
  Currency translation adjustment  2,393  10  2,403 
 Balance at December 31, 2013  57,175  434  57,609 
  Purchases  3,044  0  3,044 
  Settlements  (1,705)  0  (1,705) 
  Unrealized gains  22,802  72  22,874 
  Currency translation adjustment  (8,899)  (28)  (8,927) 
 Balance at December 31, 2014 $72,417 $478 $72,895 
Schedule of Expected Benefit Payments [Table Text Block]
             Other 
   Pension Benefits  Postretirement 
    Foreign  Domestic  Total  Benefits 
  2015$1,789 $4,590 $6,379 $568 
  2016 1,953  4,609  6,562  560 
  2017 2,202  4,447  6,649  551 
  2018 2,346  4,479  6,825  523 
  2019 2,758  4,442  7,200  505 
  2020 and beyond 17,483  22,178  39,661  2,130