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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) (USD $)
In Thousands, except Share data
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interests [Member]
Balance at Dec. 31, 2010$ 250,429$ 164$ 0$ 198,849$ 51,553$ (137)$ 0
Balance (in shares) at Dec. 31, 2010 16,468(3)    
Net income attributable to Sterling common stockholders7,7160007,71600
Net income attributable to noncontrolling interest included in equity800000080
Other comprehensive income27700002770
Purchases of treasury shares(3,592)0(3,592)0000
Purchases of treasury shares (in shares) 0(286)    
Cancellation of treasury shares0(1)2,160(1,991)(168)00
Cancellation of treasury shares (in shares) (167)167    
Stock issued upon option & warrant exercises15610155000
Stock issued upon option & warrant exercises (in shares) 960    
Excess tax benefits from exercise of stock options680068000
Issuance and amortization of restricted stock35200352000
Issuance and amortization of restricted stock (in shares) 460    
Stock based compensation expense300030000
Equity attributable to noncontrolling interests in acquired companies1,226000001,226
Balance at Sep. 30, 2011$ 256,742$ 164$ (1,432)$ 197,463$ 59,101$ 140$ 1,306
Balance (in shares) at Sep. 30, 2011 16,443(122)