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Condensed consolidated statements of cash flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities    
Net income (loss) $ (22,948) $ 28,656
Adjustments to reconcile net income (loss) to net cash provided by operating activities    
Depreciation expense 9,284 9,513
Amortization of intangible assets 6,612 6,769
Share-based compensation expense 5,084 5,031
Deferred income taxes (10,832) (1,322)
Deferred financing costs written off 2,588 0
Earnings from equity investment, net of distributions (577) (4,571)
Other (429) 911
Changes in operating assets and liabilities    
Accounts receivable—trade 28,764 30,238
Inventories 9,048 (37,610)
Prepaid expenses and other current assets 6,762 1,554
Accounts payable, deferred revenue and other accrued liabilities 191 12,593
Costs and estimated profits in excess of billings, net (6,691) (3,275)
Net cash provided by operating activities 26,856 48,487
Cash flows from investing activities    
Acquisition of businesses, net of cash acquired 0 (60,836)
Capital expenditures for property and equipment (4,261) (11,421)
Proceeds from sale of business, property and equipment 309 662
Net cash used in investing activities (3,952) (71,595)
Cash flows from financing activities    
Borrowings of long term and short term debt 8 65,008
Repayment of long term and short term debt (199) (25,323)
Repurchases of stock 0 (5,885)
Proceeds from stock issuance 165 884
Deferred Financing costs (513) 0
Net cash provided by (used in) financing activities (539) 34,684
Effect of exchange rate changes on cash 363 (4,264)
Net increase in cash and cash equivalents 22,728 7,312
Cash and cash equivalents    
Beginning of period 109,249 76,579
End of period $ 131,977 $ 83,891