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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating activities:    
Net income $ 9,739 $ 4,671
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Depreciation and amortization 5,429 5,771
Deferred income tax 1,380 (1,994)
Gain on sale of property, plant and equipment (74) (122)
Provision for uncollectible accounts 334 465
Stock-based compensation expense 1,658 1,457
Excess Tax Benefit from Share-based Compensation, Operating Activities (20) (660)
Other 60 59
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions:    
Accounts receivable 16,181 30,379
Costs and estimated earnings in excess of billings on uncompleted contracts 2,467 (16,811)
Inventories (90) 39
Other assets and liabilities 293 10,726
Accounts payable (26,197) (17,531)
Billings on uncompleted contracts in excess of costs and estimated earnings (21,429) (4,732)
Accrued expenses (4,182) (6,605)
Net cash provided (used) by operating activities (14,451) 5,112
Investing activities:    
Acquisition of property, plant and equipment (3,941) (3,656)
Acquisition, net of cash acquired 0 (5,250)
Proceeds from asset sales 135 148
Net cash used by investing activities (3,806) (8,758)
Financing activities:    
Proceeds from Noncontrolling Interests 8,433 0
Issuances of common stock 384 193
Excess tax benefit of exercised stock options and vesting of deferred shares 20 660
Advances under credit agreement 962 5,817
Repayments of advances under credit agreement 0 (6,094)
Proceeds from issuance of common stock under employee stock purchase plan 72 58
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (382) (913)
Net cash provided (used) by financing activities 9,489 (279)
Effect of exchange rate changes on cash (1,291) (436)
Net decrease in cash and cash equivalents (10,059) (4,361)
Cash and cash equivalents, beginning of period 79,239 77,115
Cash and cash equivalents, end of period 69,180 72,754
Supplemental disclosure of cash flow information:    
Income taxes 1,747 (1,972)
Interest 311 524
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 603 $ 370