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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 10,409 $ 24,058
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 14,702 7,517
Non-cash deferred revenue (2,543) (808)
Increase in inventory reserve 2,314 2,481
Unrealized loss on investment in equity securities 569  
Unrealized gain on foreign currency contracts (562)  
Stock based compensation 1,659 1,650
Deferred income tax provision 558 682
Other 1,022 (353)
Changes in assets and liabilities:    
Trade receivables 75,527 22,157
Contract assets (38,629) (37,280)
Inventories (12,596) (58)
Prepaid expenses and other current assets (6,390) (1,241)
Accounts payable and other current liabilities (1,297) 4,124
Contract liabilities, current 924 1,161
Other non-current assets and liabilities (44) 388
Discontinued operations:    
Non-current liabilities 152 265
Net cash used in discontinued operations (217) (292)
Net cash provided by operating activities 45,558 24,451
Cash flows from investing activities:    
Capital expenditures (19,237) (23,791)
Acquisition of businesses, net of cash acquired (248,467)  
Net cash used in investing activities (267,704) (23,791)
Cash flows from financing activities:    
Borrowings 220,000  
Repayments (22,500)  
Debt issuance costs (2,836)  
Principal payments under finance lease obligations (276)  
Proceeds from stock options exercised 65 2,722
Net cash provided by financing activities 194,453 2,722
Effect of exchange rate changes on cash and cash equivalents (620) 902
Net (decrease)/increase in cash and cash equivalents (28,313) 4,284
Cash and cash equivalents at beginning of period 95,852 183,284
Cash and cash equivalents at end of period $ 67,539 $ 187,568