CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net Income (Loss)	$ (26,576)	$ (35,689)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock-based compensation	7,189	7,514
Depreciation	4,809	2,942
Amortization of intangible assets	4,988	10,531
Non-cash interest expense and amortization of convertible debt issuance costs	1,678	2,680
Deferred income taxes	(214)	(8,834)
Restructuring Costs	0	670
Gain (Loss) on Sale of Equity Investments	81	0
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	0	(155)
(Gain) loss from disposal of property, plant and equipment	98	(45)
Change in operating assets and liabilities, net of impact of acquisitions:
Accounts receivable	7,372	(761)
Unbilled Receivables	44,181	47,778
Prepaid expenses and other assets	(1,153)	(2,236)
Inventories	(1,370)	(595)
Accounts payable	2,171	(1,531)
Accrued salaries and benefits and other liabilities	(4,699)	(1,113)
Increase (Decrease) in Income Taxes Payable	(3,939)	(562)
Deferred revenue	(3,571)	(3,817)
Increase (decrease) in operating lease liabilities	(2,284)	0
Net cash provided by operating activities	28,761	16,777
Cash flows from investing activities:
Purchases of property, plant and equipment	(664)	(1,688)
Purchases of marketable securities	(131,601)	(79,207)
Maturities of marketable securities	130,772	14,225
Proceeds from sale of property, plant and equipment	0	10
Net cash used in investing activities	(1,493)	(66,660)
Cash flows from financing activities:
Proceeds received from issuance of common stock under employee stock plans	4,856	1,058
Principal payments against lease financing obligation	0	(241)
Payments Related to Tax Withholding for Share-based Compensation	(3,786)	(4,900)
Payments under Installment	(1,240)	0
Payments for Repurchase of Common Stock	0	(50,000)
Net cash used in financing activities	(170)	(54,083)
Effect of Exchange Rate on Cash and Cash Equivalents	0	483
Net increase (decrease) in cash and cash equivalents	27,098	(103,483)
Cash and cash equivalents at beginning of period	116,252	225,844
Cash and cash equivalents at end of period	143,350	122,361
Non-cash investing and financing activities during the period:
Property, plant and equipment received and accrued in accounts payable and other liabilities	$ 6,828	$ 286

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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- Definition

Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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-SubTopic 10
-Section 50
-Paragraph 2A
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-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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- Definition

Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Publisher FASB
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-Section 45
-Paragraph 12
-Subparagraph (a)
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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
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- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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