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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
OPERATING ACTIVITIES    
Net income $ 22,357 $ 32,710
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 22,584 20,360
Asset impairment 1,109 0
Interest accretion of convertible notes discount 5,654 5,226
Employee share-based compensation expense 7,786 5,883
Financing costs amortization 647 653
Unrealized foreign currency transaction gain (1,309) (561)
Other non-cash operating activities (424) (361)
Changes in asset and liabilities, net of acquisitions:    
Accounts receivable (15,153) 23,528
Inventory (17,802) (16,824)
Unbilled contract revenues and other assets 13,944 (13,261)
Accounts payable and other liabilities (30,656) (2,850)
Customer advances and billings in excess of contract revenue (119) (12,160)
Net Cash Provided By Operating Activities 8,618 42,343
INVESTING ACTIVITIES    
Capital expenditures (24,479) (25,665)
Payments for land use rights (11,043) 0
Proceeds from sale of assets 200 1,691
Acquisition of businesses (320) (11,943)
Net Cash Used In Investing Activities (35,642) (35,917)
FINANCING ACTIVITIES    
Borrowings on revolving credit facilities 12,377 7,884
Repayments on revolving credit facilities (743) (3,252)
Payments on long-term debt 0 (1,875)
Proceeds from exercise of stock options 469 624
Excess tax (deficiency) benefit from share-based compensation (494) 1,727
Payment of contingent consideration (611) (741)
Common stock repurchases (823) (3,291)
Dividend distribution to noncontrolling interest 0 (1,206)
Other financing activities (157) 0
Net Cash Provided By (Used In) Financing Activities 10,018 (130)
Effect of exchange rate changes on cash (3,765) (967)
Net (decrease) increase in cash and cash equivalents (20,771) 5,329
Cash and cash equivalents at beginning of period 103,656 137,345
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 82,885 $ 142,674