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Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2016
Stockholders' Equity Note [Abstract]  
Schedule of Activity in Shareholders' Equity

Activity in Shareholders’ equity for 2014, 2015, and 2016 is presented below:

  Class A
Common Stock
   Class B
Preferred Stock
Additional paid-in capital Retained earnings Accumulated
items of other
comprehensive
income
Class A
Treasury Stock
Noncontrolling Interest
(in thousands) Shares Amount   Shares Amount Shares Amount
January 1, 2014   36,996 $37       3,236 $3 $416,728 $434,598 ($49,498)      8,464 ($257,571) $3,482
Net income             -            -               -           -                  -        41,569                       -              -                 -                180
Compensation and benefits paid or payable in shares          47            -               -           -          1,234                  -                       -              - - -
Conversion of Class B shares to Class A shares            1            -            (1)           -                -                     -                       -              -                 - -
Changes in equity related to Noncontrolling interest in ASC             -            -               -           -             (24)                  -                       -              -                 -                  38
Options exercised          41            -               -           -             974                  -                       -              - - -
Shares issued to Directors'             -            -               -           -               60                -                        -               (5)              90  - 
Dividends declared             -            -               -           -                  -       (20,062)                -                 -                     -
Cumulative translation adjustments             -            -               -           -                  -                  -            (55,102)              -                 -                   (1)
Pension and postretirement liability adjustments             -            -               -           -                  -                  -              (3,283)              -                 -                     -
Derivative valuation adjustment             -            -               -           -                  -                  -                  116              -                 -                     -
December 31, 2014   37,085 $37       3,235 $3 $418,972 $456,105 ($107,767)      8,459 ($257,481) $3,699
Net income             -            -               -           -                  -        57,279                       -              -                 -                 (14)
Compensation and benefits paid or payable in shares          55            -               -           -          1,540                  -                       -              - - -
Options exercised          99            -               -           -          2,520                  -                       -              - - -
Shares issued to Directors'             -            -               -           -               76                -                        -               (4)              90  - 
Dividends declared             -            -               -           -                  -       (21,434)                -                 -                     -
Cumulative translation adjustments             -            -               -           -                  -                  -            (53,415)              -                 -                    5
Pension and postretirement liability adjustments             -            -               -           -                  -                  -               2,941              -                 -                     -
Derivative valuation adjustment             -            -               -           -                  -                  -                 (603)              -                 -                     -
December 31, 2015   37,239 $37       3,235 $3 $423,108 $491,950 ($158,844)      8,455 ($257,391) $3,690
Net income             -            -               -           -                  -        52,733                       -              -                 -                  79
Compensation and benefits paid or payable in shares          53            -               -           -          1,980                  -                       -              -                 - 0
Options exercised          26            -               -           -             667                  -                       -              -                 - 0
Shares issued to Directors'            1            -            (1)           -             198                -                        -             (12)            255                   -   
Dividends declared             -            -               -           -                  -       (21,828)                       -              -                 -                     -
Cumulative translation adjustments             -            -               -           -                  -                  -            (24,643)              -                 -                   (2)
Pension and postretirement liability adjustments             -            -               -           -                  -                  -              (2,994)              -                 -                     -
Derivative valuation adjustment             -            -               -           -                  -                  -               2,292              -                 -                     -
December 31, 2016   37,319 $37       3,234 $3 $425,953 $522,855 ($184,189)      8,443 ($257,136) $3,767