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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Operating activities:    
Net income $ 14,592 $ 12,857
Adjustments to reconcile net income to net cash used by operating activities, net of effects from acquisitions:    
Depreciation and amortization 9,988 10,720
Deferred income tax 970 1,390
Gain on sale of property, plant and equipment (131) (37)
Provision for uncollectible accounts (34) 5,544
Stock-based compensation expense 3,547 3,509
Other 133 119
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions:    
Accounts receivable (48,972) (13,820)
Costs and estimated earnings in excess of billings on uncompleted contracts 24,451 4,328
Inventories (259) 85
Other assets and liabilities (3,974) (8,861)
Accounts payable (34,276) (16,743)
Billings on uncompleted contracts in excess of costs and estimated earnings 4,883 17,436
Accrued expenses (1,826) (6,840)
Net cash provided (used) by operating activities (30,908) 9,687
Investing activities:    
Acquisition, net of cash acquired (39,798) 0
Acquisition of property, plant and equipment (4,208) (7,516)
Proceeds from asset sales 196 145
Net cash used by investing activities (43,810) (7,371)
Financing activities:    
Advances under senior revolving credit facility 102,084 2,753
Repayments of advances under senior revolving credit facility (29,672) (4,331)
Issuances of common stock 222 457
Payments of debt issuance costs (168) 0
Proceeds from issuance of common stock under employee stock purchase plan 169 166
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (2,270) (4,488)
Capital contributions from noncontrolling interest 0 8,433
Net cash provided by financing activities 70,365 2,990
Effect of exchange rate changes on cash and cash equivalents (1,073) (2,114)
Increase (decrease) in cash and cash equivalents (5,426) 3,192
Cash and cash equivalents, beginning of period 71,656 79,239
Cash and cash equivalents, end of period 66,230 82,431
Supplemental disclosure of cash flow information:    
Income taxes 8,361 9,112
Interest 399 521
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 421 $ 726