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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) [Abstract]    
Net income attributable to Sterling common stockholders $ 4,255 $ 6,219
Noncontrolling owners' interests in earnings of subsidiaries and joint ventures 3,519 1,911
Net income 7,774 8,130
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,436 8,103
(Gain) loss on disposal of property and equipment (154) 127
Deferred tax expense 1,665 945
Stock-based compensation expense 258 297
Interest expense accreted on noncontrolling interest 424 584
(Gain) loss on sale of securities and other 245 (964)
Tax benefits from exercise of stock options 0 (18)
Other changes in operating assets and liabilities:    
(Increase) decrease in contracts receivable (7,334) 7,530
(Increase) decrease in costs and estimated earnings in excess of billings on uncompleted contracts (9,382) (685)
(Increase) decrease in income tax receivable (1,131) 0
(Increase) decrease in prepaid expenses and other assets 203 (482)
(Increase) decrease in receivables from and equity in construction joint ventures 834 (2,266)
Increase (decrease) in trade payables 17 1,935
Increase (decrease) in billings in excess of costs and estimated earnings on uncompleted contracts 1,217 14
Increase (decrease) in accrued compensation and other liabilities 3,496 493
Net cash provided by operating activities 6,568 23,743
Cash flows from investing activities:    
Additions to property and equipment (15,171) (3,605)
Proceeds from sale of property and equipment 564 465
Purchases of short-term securities, available for sale (83,162) (77,451)
Sales of short-term securities, available for sale 58,601 56,536
Net cash used in investing activities (39,168) (24,055)
Cash flows from financing activities:    
Cumulative daily drawdowns - Credit Facility 2,000 55,000
Cumulative daily repayments - Credit Facility (2,000) (70,000)
Repayments under long-term obligations (37) (36)
Purchases of treasury stock (1,841) 0
Issuance of common stock pursuant to warrants and options exercised 122 123
Distributions to noncontrolling interest owners (4,818) (2,376)
Utilization of tax benefits from exercise of stock options 0 18
Net cash used in financing activities (6,574) (17,271)
Net increase (decrease) in cash and cash equivalents (39,174) (17,583)
Cash and cash equivalents at beginning of period 49,441 54,406
Cash and cash equivalents at end of period 10,267 36,823
Supplemental disclosures of cash flow information:    
Cash paid during the period for interest 64 32
Cash paid during the period for income taxes 2,029 0
Non-cash items:    
Reclassification of amounts payable to noncontrolling interest owner $ 1,054 $ 0