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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restricted Cash and Cash Equivalents $ 6,436,000  
OPERATING ACTIVITIES    
Net loss (2,952,000) $ (4,672,000)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 9,161,000 9,479,000
Interest accretion of convertible notes discount 3,277,000 3,029,000
Employee share-based compensation expense 6,274,000 5,537,000
Financing costs amortization 321,000 321,000
Unrealized foreign currency transaction loss (gain) 193,000 (50,000)
Other non-cash operating activities 606,000 506,000
Changes in assets and liabilities, net of acquisitions:    
Accounts receivable 16,178,000 44,126,000
Inventory (20,909,000) (3,111,000)
Unbilled contract revenues and other assets (4,847,000) 19,187,000
Accounts payable and other liabilities (10,530,000) (48,239,000)
Customer advances and billings in excess of contract revenue 4,428,000 12,066,000
Net Cash Provided By Operating Activities 1,200,000 38,179,000
INVESTING ACTIVITIES    
Capital expenditures (8,386,000) (5,232,000)
Government grants 145,000 0
Acquisition of businesses, net of cash acquired (23,162,000) 0
Net Cash Used In Investing Activities (31,403,000) (5,232,000)
FINANCING ACTIVITIES    
Borrowings on revolving credit facilities 2,176,000 3,820,000
Repayments on revolving credit facilities (3,627,000) (3,056,000)
Proceeds from exercise of options 32,000 12,000
Excess tax benefit from share-based compensation 0 24,000
Common stock repurchases (1,794,000) (601,000)
Net Cash (Used In) Provided By Financing Activities (3,213,000) 199,000
Effect of exchange rate changes on cash 727,000 2,200,000
Net (decrease) increase in cash, cash equivalents, restricted cash, and restricted cash equivalents (32,689,000) 35,346,000
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents at Beginning of Period 282,949,000 123,708,000
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents at End of Period 250,260,000 159,054,000
Other Current Assets [Member]    
Restricted Cash and Cash Equivalents 5,446,000  
Other Noncurrent Assets [Member]    
Restricted Cash and Cash Equivalents $ 990,000 $ 990,000