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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating activities:    
Net income $ 9,342 $ 9,739
Adjustments to reconcile net income to net cash used by operating activities:    
Depreciation and amortization 4,904 5,429
Deferred income tax 1,044 1,380
Gain on sale of property, plant and equipment (138) (74)
Provision for uncollectible accounts 54 334
Stock-based compensation expense 1,652 1,658
Other 63 60
Changes in operating assets and liabilities increasing (decreasing) cash:    
Accounts receivable (40,595) 16,181
Costs and estimated earnings in excess of billings on uncompleted contracts (1,093) 2,467
Inventories 168 (90)
Other assets and liabilities (2,206) 293
Accounts payable (13,597) (26,197)
Billings on uncompleted contracts in excess of costs and estimated earnings (5,945) (21,429)
Accrued expenses (3,241) (4,182)
Net cash used by operating activities (49,588) (14,431)
Investing activities:    
Acquisition of property, plant and equipment (1,826) (3,941)
Proceeds from asset sales 153 135
Net cash used by investing activities (1,673) (3,806)
Financing activities:    
Advances under senior revolving credit facility 27,186 962
Repayments of advances under senior revolving credit facility (10,000) 0
Issuances of common stock 46 384
Proceeds from issuance of common stock under employee stock purchase plan 83 72
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (1,878) (382)
Capital contributions from noncontrolling interest 0 8,433
Net cash provided by financing activities 15,437 9,469
Effect of exchange rate changes on cash and cash equivalents (253) (1,291)
Decrease in cash and cash equivalents (36,077) (10,059)
Cash and cash equivalents, beginning of period 71,656 79,239
Cash and cash equivalents, end of period 35,579 69,180
Supplemental disclosure of cash flow information:    
Income taxes 2,997 1,747
Interest 238 311
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 79 $ 603