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Consolidated Statements of Equity (USD $)
In Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interest [Member]
Total
Balances at Dec. 31, 2009 $ 5,100 $ 498 $ 182,377 $ (11,070) $ 707 $ 177,612
Net income     25,963   66 26,029
Currency translation adjustments       139 (46) 93
Pension and OPEB adjustments       1,549   1,549
Total comprehensive income     25,963 1,688 20 27,671
Purchase of noncontrolling interest   166   (46) (727) (607)
Purchase of 31,250 treasury shares (8) (487) (143)     (638)
Issuance of treasury shares 35 2,223 562     2,820
Cash dividends     (7,024)     (7,024)
Balances at Dec. 31, 2010 5,127 2,400 201,735 (9,428)   199,834
Net income     28,804     28,804
Currency translation adjustments       (886)   (886)
Pension and OPEB adjustments       (5,730)   (5,730)
Total comprehensive income 0 0 28,804 (6,616) 0 22,188
Issuance of treasury shares 1 144 27     172
Cash dividends     (7,430)     (7,430)
Balances at Dec. 31, 2011 5,128 2,544 223,136 (16,044) 0 214,764
Net income     28,203     28,203
Currency translation adjustments       437   437
Pension and OPEB adjustments       (675)   (675)
Total comprehensive income     28,203 (238)   27,965
Issuance of treasury shares 2 149 27     178
Cash dividends     (8,188)     (8,188)
Balances at Dec. 31, 2012 $ 5,130 $ 2,693 $ 243,178 $ (16,282) $ 0 $ 234,719