Basis Of Presentation Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting, Policy	The accompanying condensed consolidated financial statements include our accounts and the accounts of our subsidiaries. All intercompany accounts and transactions have been eliminated. Our interim financial statements have been prepared in accordance with generally accepted accounting principles in the United States ("U.S. GAAP") for interim financial information and the rules and regulations of the Securities and Exchange Commission ("SEC") for interim financial statements and accounting policies, consistent, in all material respects with those applied in preparing our audited consolidated financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2011, filed with the SEC on February 29, 2012. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In our opinion, all adjustments, consisting of only normal recurring adjustments considered necessary for fair presentation, have been included.
Fiscal Period, Policy	Our fiscal periods end on the Saturday closest to month-end, except that our fiscal year ends on December 31. All references to the quarter or three month period refer to our fiscal quarter. Our fiscal quarters covered by this report ended on June 30, 2012 and July 2, 2011.
Use of Estimates, Policy	USE OF ESTIMATES — The preparation of the financial statements and related disclosures in conformity with U.S. GAAP require us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and the related disclosure of contingent assets and liabilities at the date of the consolidated financial statements. By their nature, these estimates and judgments are subject to an inherent degree of uncertainty. On an ongoing basis, we evaluate our estimates, including those related to inventories, warranty obligations, purchase order commitments, asset retirement obligations, bad debts, estimated useful lives of fixed assets, asset impairment, income taxes, intangible assets, contingencies and litigation. We base our estimates on historical experience and on various other analyses and assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.
Impact of Recently Issued Accounting Standards, Policy	IMPACT OF RECENTLY ISSUED ACCOUNTING STANDARDS —In June 2011, the FASB issued ASU No. 2011-05, Comprehensive Income, Presentation of Comprehensive Income and in December 2011, the FASB issued ASU No. 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassification of Items Out of Accumulated Other Comprehensive Income in ASU 2011-05 to increase the prominence of items reported in other comprehensive income. Specifically, the new guidance allows an entity to present components of net income or other comprehensive income in one continuous statement, referred to as the statement of comprehensive income, or in two separate, but consecutive statements. The new guidance eliminates the current option to report other comprehensive income and its components in the consolidated statement of shareholders' equity. While the new guidance changes the presentation of comprehensive income, there are no changes to the components that are recognized in net income or other comprehensive income under current accounting guidance. This new guidance is effective for fiscal years and interim periods beginning after December 15, 2011. We adopted this guidance on January 1, 2012 and have presented a new financial statement titled Condensed Consolidated Statement of Comprehensive Income for the three and six month periods ending June 30, 2012 and July 2, 2011.
Revenue Recognition, Policy	Revenue Recognition We recognize revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the arrangement consideration is fixed or determinable, and collectability is reasonably assured. We derive revenue from four sources: system sales, spare parts sales, service contracts and license fees. Provided all other criteria are met, we recognize revenues on system sales when system acceptance provisions have been met in accordance with the terms and conditions of the arrangement. In the event that terms of the sale provide for a lapsing system acceptance period, we recognize revenue upon the expiration of the lapsing acceptance period or system acceptance, whichever occurs first. In these instances, which are infrequent, revenue is recorded only if the product has met product specifications prior to shipment and management deems that no significant uncertainties as to product performance exist. Our transactions frequently include the sale of systems and services under multiple element arrangements. In transactions with multiple deliverables, revenue is recognized upon the delivery of the separate elements and when system acceptance has occurred or we are otherwise released from our system acceptance obligations. In the first quarter of 2011, we adopted Accounting Standard Update (“ASU”) No. 2009-13, Revenue Recognition ("Topic 605") - Multi-Deliverables Revenue Arrangements, a Consensus of the FASB Emerging Issues Task Force on a prospective basis for applicable transactions originating or materially modified on or subsequent to January 1, 2011. The new standard changed the requirements for establishing separate units of accounting in a multiple element arrangement and requires the allocation of arrangement consideration to each deliverable to be based on the relative selling price. Implementation of this new authoritative guidance had an insignificant impact on reported revenue as compared to revenue under previous guidance, as the new guidance did not change the units of accounting within sales arrangements and the elimination of the residual method for the allocation of arrangement consideration had an insignificant impact on the amount and timing of reported revenue. For multiple element arrangements entered into or materially modified on or subsequent to January 1, 2011, the total consideration for an arrangement is allocated among the separate elements in the arrangement based on a selling price hierarchy. The selling price hierarchy for a deliverable is based on (i) vendor specific objective evidence ("VSOE"); if available; (ii) third party evidence of selling price if VSOE is not available; or (iii) an estimated selling price, if neither VSOE nor third party evidence is available. If we have not established VSOE and cannot obtain third party evidence of selling price, we determine our estimate of the relative selling price by considering our production costs and historical margins of similar products or services. We believe this best represents the price at which we would transact a sale if the product or service were sold on a stand-alone basis. We regularly review the method used to determine our relative selling price and update any estimates accordingly. We limit the amount of revenue recognized for delivered elements to the amount that is not contingent on the future delivery of products or services or other future performance obligations. For multiple element arrangements entered into prior to January 1, 2011, revenue is allocated among the separate accounting units based on the residual method under which the revenue is allocated to undelivered elements based on fair value of such undelivered elements and the residual amounts of revenue are allocated to delivered elements, provided the delivered elements have value on a stand alone basis, there is objective and reliable evidence of fair value for the undelivered elements, the arrangement does not include a general right of return relative to the delivered item and delivery or performance of the undelivered item(s) is considered probable and substantially in our control. The maximum revenue recognized on a delivered element is limited to the amount that is not contingent upon the delivery of additional items. We generally recognize revenue from spare parts sales upon shipment, as our products are generally sold on terms that transfer title and risk of ownership when it leaves our site. We sell service contracts for which revenue is deferred and recognized ratably over the contract period (for time-based service contracts) or as service hours are delivered (for contracts based on a purchased quantity of hours). We recognize license revenue from transactions in which our systems are re-sold by our customers to third parties, as well as from royalty arrangements. Costs related to deferred product revenues are capitalized (deferred) and recognized at the time of revenue recognition. Deferred product revenue and costs are netted on our balance sheet, under the caption “deferred product and services income.” The gross amount of deferred revenues and deferred costs at June 30, 2012 were $36.7 million and $11.4 million, respectively, as compared to $20.7 million and $5.7 million, respectively, at December 31, 2011. Costs incurred for shipping and handling are included in cost of sales.
Other Assets, Policy	Other Assets Included in other assets at June 30, 2012 is restricted cash in the amount of $0.2 million. The restricted cash is in the form of an interest bearing account. Our obligation will be released upon the completion of our warranty obligation for a certain customer.

Entity's cash and cash equivalents accounting policy with respect to restricted balances. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits.

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Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed.

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Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.

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Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

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