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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
OPERATING ACTIVITIES    
Net (loss) income $ (4,672) $ 5,275
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 9,479 11,376
Interest accretion of convertible notes discount 3,029 2,799
Employee share-based compensation expense 5,537 5,752
Financing costs amortization 321 326
Unrealized foreign currency transaction gain (50) (60)
Other non-cash operating activities 506 642
Changes in assets and liabilities, net of acquisitions:    
Accounts receivable 44,126 (6,875)
Inventory (3,111) (18,761)
Unbilled contract revenues and other assets 19,187 3,442
Accounts payable and other liabilities (48,239) (8,620)
Customer advances and billings in excess of contract revenue 12,066 5,592
Net Cash Provided By Operating Activities 38,179 888
INVESTING ACTIVITIES    
Capital expenditures (5,232) (14,828)
Proceeds from sale of assets 0 8
Acquisition of businesses, net of cash acquired 0 (320)
Net Cash Used In Investing Activities (5,232) (15,140)
FINANCING ACTIVITIES    
Borrowings on revolving credit facilities 3,820 0
Repayments on revolving credit facilities (3,056) 0
Proceeds from exercise of options 12 422
Excess tax benefit from share-based compensation 24 130
Common stock repurchases (601) (808)
Other financing activities 0 (157)
Net Cash Provided By (Used In) Financing Activities 199 (413)
Effect of exchange rate changes on cash 2,200 (5,624)
Net increase (decrease) in cash and cash equivalents 35,346 (20,289)
Cash and cash equivalents at beginning of period 123,708 103,656
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 159,054 $ 83,367