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Consolidated statements of cash flows - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities      
Net income (loss) $ (81,948,000) $ (119,384,000) $ 174,377,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities      
Depreciation expense 35,636,000 38,388,000 37,414,000
Amortization of intangible assets 26,124,000 27,295,000 27,658,000
Goodwill and Intangible asset impairment 0 125,092,000 0
Inventory reserves 25,537,000 51,917,000 8,171,000
Share-based compensation expense 20,535,000 21,675,000 18,770,000
Earnings from equity investment, net of distributions (1,421,000) (8,044,000) 1,376,000
Deferred income taxes (24,418,000) (23,246,000) (3,270,000)
Deferred loan costs written off 2,978,000 0 0
Provision for doubtful accounts 485,000 4,358,000 2,492,000
Other 4,389,000 3,867,000 4,109,000
Changes in operating assets and liabilities      
Accounts receivable—trade 29,450,000 145,753,000 (44,727,000)
Inventories 57,294,000 344,000 (34,051,000)
Increase (Decrease) in Income Taxes Receivable (32,801,000) 0 0
Prepaid expenses and other current assets 1,071,000 3,576,000 (4,107,000)
Cost and estimated profit in excess of billings 1,897,000 2,215,000 8,742,000
Accounts payable, deferred revenue and other accrued liabilities 3,799,000 (111,264,000) 62,772,000
Billings in excess of costs and estimated profits earned (3,865,000) (6,629,000) 10,240,000
Net cash provided by operating activities 64,742,000 155,913,000 269,966,000
Cash flows from investing activities      
Acquisition of businesses, net of cash acquired (4,072,000) (60,836,000) (38,289,000)
Capital expenditures for property and equipment (16,828,000) (32,291,000) (53,792,000)
Return of investment in unconsolidated subsidiary 0 0 9,240,000
Proceeds from sale of business, property and equipment 9,763,000 1,821,000 12,150,000
Net cash used in investing activities (11,137,000) (91,306,000) (70,691,000)
Cash flows from financing activities      
Borrowings under credit facility 0 94,984,000 15,423,000
Repayment of long-term debt 0 (120,077,000) (98,415,000)
Repurchases of stock (623,000) (6,438,000) (96,632,000)
Excess tax benefits from stock based compensation 0 (8,000) 7,742,000
Proceeds from stock issuance 87,676,000 5,275,000 11,101,000
Payment of capital lease obligation (92,000) (673,000) (1,231,000)
Deferred financing costs (766,000) 0 (6,000)
Net cash provided by (used in) financing activities 86,195,000 (26,937,000) (162,018,000)
Effect of exchange rate changes on cash (14,627,000) (5,000,000) (260,000)
Net increase in cash and cash equivalents 125,173,000 32,670,000 36,997,000
Cash and cash equivalents      
Beginning of period 109,249,000 76,579,000 39,582,000
End of period 234,422,000 109,249,000 76,579,000
Supplemental cash flow disclosures      
Interest paid 26,331,000 27,870,000 27,628,000
Income taxes paid (refunded) (6,273,000) 19,919,000 55,576,000
Noncash investing and financing activities      
Accrued purchases of property and equipment 797,000 929,000 765,000
Accrued consideration for acquisition $ 0 $ 1,070,000 $ 0