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Consolidated Statements of Changes in Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings, Unappropriated [Member]
Parent [Member]
Noncontrolling Interest [Member]
Balance at Dec. 31, 2012 $ 428,158 $ 107,010 $ 104,911 $ (12,469) $ (137) $ 228,628 $ 427,943 $ 215
Balance (in shares) at Dec. 31, 2012   356,700   (17,550)        
Restricted stock vested 0 $ 0 (1,349) $ 1,349 0 0 0 0
Restricted stock vested (in shares)   0   1,900        
Share-based compensation expenses 1,840 $ 0 1,838 $ 0 0 0 1,838 2
Excess tax benefits from restricted stock vested 1,271 0 1,271 0 0 0 1,271 0
New shares issued by subsidiary 6,245 0 2,426 0 0 0 2,426 3,819
Sale (purchase) of subsidiary shares to (from) noncontrolling interests (2,241) 0 (2,461) 0 0 0 (2,461) 220
Declaration of cash dividends (42,394) 0 0 0 0 (42,394) (42,394) 0
Comprehensive Income:                
Net income (loss) 55,924 0 0 0 0 61,476 61,476 (5,552)
Other comprehensive income (loss) (244) 0 0 0 (275) 0 (275) 31
Balance at Dec. 31, 2013 448,559 $ 107,010 106,636 $ (11,120) (412) 247,710 449,824 (1,265)
Balance (in shares) at Dec. 31, 2013   356,700   (15,650)        
Restricted stock vested 0 $ 0 (976) $ 976 0 0 0 0
Restricted stock vested (in shares)   0   1,375        
Share-based compensation expenses 1,929 $ 0 1,929 $ 0 0 0 1,929 0
Excess tax benefits from restricted stock vested 1,232 0 1,232 0 0 0 1,232 0
Sale (purchase) of subsidiary shares to (from) noncontrolling interests (1,394) 0 (1,013) 0 0 0 (1,013) (381)
Declaration of cash dividends (46,042) 0 0 0 0 (46,042) (46,042) 0
Comprehensive Income:                
Net income (loss) 63,903 0 0 0 0 66,598 66,598 (2,695)
Other comprehensive income (loss) 110 0 0 0 96 0 96 14
Balance at Dec. 31, 2014 468,297 $ 107,010 107,808 $ (10,144) (316) 268,266 472,624 (4,327)
Balance (in shares) at Dec. 31, 2014   356,700   (14,275)        
Restricted stock vested 0 $ 0 (987) $ 987 0 0 0 0
Restricted stock vested (in shares)   0   1,390        
Share-based compensation expenses 1,818 $ 0 1,804 $ 0 0 0 1,804 14
Excess tax benefits from restricted stock vested 771 0 771 0 0 0 771 0
New shares issued by subsidiary 1,466 0 (3,782) 0 0 (3,993) (7,775) 9,241
Sale (purchase) of subsidiary shares to (from) noncontrolling interests (481) 0 (275) 0 0 (729) (1,004) 523
Acquisition of Liqxtal Technology Inc. 1,001 0 0 0 0 0 0 1,001
Adjustment arising from changes in percentage of ownership in equity method investees 16 0 16 0 0 0 16 0
Declaration of cash dividends (51,364) 0 0 0 0 (51,364) (51,364) 0
Comprehensive Income:                
Net income (loss) 21,462 0 0 0 0 25,195 25,195 (3,733)
Other comprehensive income (loss) (1,645) 0 0 0 (1,563) 0 (1,563) (82)
Balance at Dec. 31, 2015 $ 441,341 $ 107,010 $ 105,355 $ (9,157) $ (1,879) $ 237,375 $ 438,704 $ 2,637
Balance (in shares) at Dec. 31, 2015   356,700   (12,885)