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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating activities:    
Net income $ 8,356 $ 14,592
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Depreciation and amortization 10,906 9,988
Deferred income tax 1,657 970
Gain on sale of property, plant and equipment (103) (131)
Provision for uncollectible accounts 12 (34)
Stock-based compensation expense 4,353 3,547
Other 194 133
Changes in operating assets and liabilities increasing (decreasing) cash:    
Accounts receivable 25,489 (48,972)
Costs and estimated earnings in excess of billings on uncompleted contracts 26,959 24,451
Inventories (788) (259)
Other assets and liabilities (475) (3,974)
Accounts payable (34,018) (34,276)
Billings on uncompleted contracts in excess of costs and estimated earnings (8,751) 4,883
Accrued expenses (4,211) (1,826)
Net cash provided (used) by operating activities 29,580 (30,908)
Investing activities:    
Acquisition, net of cash acquired (1,687) (39,798)
Acquisition of property, plant and equipment (4,051) (4,208)
Proceeds from asset sales 420 196
Net cash used by investing activities (5,318) (43,810)
Financing activities:    
Advances under senior revolving credit facility 85,669 102,084
Repayments of advances under senior revolving credit facility (79,443) (29,672)
Payments of debt issuance costs (364) (168)
Issuances of common stock 0 222
Proceeds from issuance of common stock under employee stock purchase plan 144 169
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (612) (2,270)
Net cash provided (used) by financing activities 5,394 70,365
Effect of exchange rate changes on cash and cash equivalents 626 (1,073)
Increase (decrease) in cash and cash equivalents 30,282 (5,426)
Cash and cash equivalents, beginning of period 43,805 71,656
Cash and cash equivalents, end of period 74,087 66,230
Supplemental disclosure of cash flow information:    
Income taxes 665 8,361
Interest 1,340 399
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 105 $ 421