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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Treasury stock [Member]
Treasury stock reserved for deferred compensation [Member]
Accumulated other comprehensive income (loss) [Member]
Parent [Member]
Noncontrolling interest [Member]
Balance, Beginning at Dec. 31, 2008 $ 279,188 $ 30 $ 300,024 $ 41,726 $ (22,332) $ (5,501) $ (34,759) $ 279,188 $ 0
Balance, Beginning (in shares) at Dec. 31, 2008   35,031,684              
Comprehensive income:                  
Net income (24,645)     (24,645)       (24,645)  
Pension liability adjustments, net of tax 5,538           5,538 5,538  
Unrealized gain on investments, net of tax 915           915 915  
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (18,192)             (18,192) 0
Dividends on common stock (704)     (704)       (704)  
Exercise of stock options 1,142   (384)   1,526     1,142  
Exercise of stock options (in shares)   170,000              
Deferred compensation transactions 101   (7)     (108)   101  
Issuance of treasury stock under 401(k) plan 418   (114)   532     418  
Issuance of treasury stock under 401(k) plan (in shares)   59,257              
Balance, Ending at Dec. 31, 2009 261,953 30 299,519 16,377 (20,274) (5,393) (28,306) 261,953 0
Balance, Ending (in shares) at Dec. 31, 2009   35,260,941              
Comprehensive income:                  
Net income (5,926)     (5,926)       (5,926)  
Pension liability adjustments, net of tax 710           710 710  
Unrealized gain on investments, net of tax 10,554           10,554 10,554  
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 5,338             5,338 0
Dividends on common stock (707)     (707)       (707)  
Exercise of stock options 285   (220)   505     285  
Exercise of stock options (in shares)   56,250              
Stock-based compensation 201   201         201  
Deferred compensation transactions 4,475   999     3,476   4,475  
Issuance of treasury stock under 401(k) plan 486   41   445     486  
Issuance of treasury stock under 401(k) plan (in shares)   49,536              
Balance, Ending at Dec. 31, 2010 272,031 30 300,540 9,744 (19,324) (1,917) (17,042) 272,031 0
Balance, Ending (in shares) at Dec. 31, 2010   35,366,727              
Comprehensive income:                  
Net income 58,136     58,152       58,152 (16)
Currency translation adjustment (12,833)           (12,833) (12,833)  
Pension liability adjustments, net of tax (7,709)           (7,709) (7,709)  
Unrealized gain on investments, net of tax 4,009           4,009 4,009  
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 41,603             41,619 (16)
Dividends on common stock (843)     (843)       (843)  
Note conversion 73,909 7 73,902         73,909  
Note conversion (in shares)   6,617,709              
Exercise of stock options 524   (98)   622     524  
Exercise of stock options (in shares) (69,375) 69,375              
Acquisitions 4,491   1,708   1,127     2,835 1,656
Acquisitions (in shares)   125,524              
Stock-based compensation 2,392   2,392         2,392  
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 706   706         706  
Deferred compensation transactions 1,530   846     684   1,530  
Issuance of treasury stock under 401(k) plan 536   299   237     536  
Issuance of treasury stock under 401(k) plan (in shares)   26,346              
Balance, Ending at Dec. 31, 2011 $ 396,879 $ 37 $ 380,295 $ 67,053 $ (17,338) $ (1,233) $ (33,575) $ 395,239 $ 1,640
Balance, Ending (in shares) at Dec. 31, 2011   42,205,681