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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating activities:    
Net income (loss) $ 16,403 $ (13,118)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 16,139 17,332
Deferred income tax 1,413 (1,026)
Gain on sale of property, plant and equipment (111) (305)
Provision for uncollectible accounts 5,684 419
Stock-based compensation expense 5,023 4,730
Excess Tax Benefit from Share-based Compensation, Operating Activities (3,222) (1,764)
Other 179 178
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions:    
Accounts receivable 23,684 17,353
Costs and estimated earnings in excess of billings on uncompleted contracts (6,575) (4,332)
Inventories 568 170
Other assets and liabilities (5,461) 2,425
Accounts payable (3,492) (23,025)
Billings on uncompleted contracts in excess of costs and estimated earnings (29,895) 31,006
Accrued expenses 983 6,932
Net cash provided by operating activities 21,320 36,975
Investing activities:    
Acquisition of property, plant and equipment (11,746) (11,075)
Acquisition, net of cash acquired (13,049) (5,551)
Proceeds from asset sales 258 653
Net cash used by investing activities (24,537) (15,973)
Financing activities:    
Proceeds from Noncontrolling Interests 10,892 7,802
Issuances of common stock 578 493
Excess tax benefit of exercised stock options and vesting of deferred shares 3,222 1,764
Advances under credit agreement 2,753 8,289
Repayments of advances under credit agreement (7,712) (9,976)
Repayments of acquired long-term debt (1,858) 0
Proceeds from issuance of common stock under employee stock purchase plan 261 215
Open market purchase of treasury shares (5,460) 0
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (4,540) (2,472)
Net cash provided (used) by financing activities (1,864) 6,115
Effect of exchange rate changes on cash and cash equivalents (755) (1,049)
Increase (decrease) in cash and cash equivalents (5,836) 26,068
Cash and cash equivalents, beginning of period 79,239 77,115
Cash and cash equivalents, end of period 73,403 103,183
Supplemental disclosure of cash flow information:    
Income taxes 9,192 6,700
Interest 789 1,019
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account 401 1,104
Acquisition of long-term debt $ 1,858 $ 0