10. Segment Information The Company s chief operating decision maker, together with other senior management personnel, currently focus their review of consolidated financial information and the allocation of resources based on reporting of operating results, including revenues and operating income for the geographic regions of the Americas, EMEA and Asia/Pacific and the Corporate segment. The Company s products are sold and supported through distribution networks covering these three geographic regions, with each distribution network having its own sales force. The Company supplements its distribution networks with independent reseller and/or distributor arrangements. All administrative costs that are not directly attributable or reasonably allocable to a geographic segment are tracked in the Corporate segment. As such, the Company has concluded that its three geographic regions are its reportable segments. The Company allocates segment support expenses such as global product development, business operations, and product management based upon percentage of revenue per segment. Depreciation and amortization and other facility related costs are allocated as a percentage of the headcount by segment. The Corporate line item consists of the corporate overhead costs that are not allocated to operating segments. Corporate overhead costs relate to human resources, finance, legal, accounting, merger and acquisition activity and amortization of acquisition-related intangibles and software as well as other costs that are not considered when management evaluates segment performance. The following is selected segment financial data for the periods indicated (in thousands): Years Ended December 31, 2014 2013 2012 Revenues: Americas   United States $ 614,488 $ 450,251 $ 277,775 Americas   Other 87,279 91,639 74,422 EMEA 230,879 228,679 218,015 Asia/Pacific 83,503 94,359 96,367 $ 1,016,149 $ 864,928 $ 666,579 Depreciation and amortization expense: Americas $ 20,548 $ 17,030 $ 10,917 EMEA 4,126 6,310 5,175 Asia/Pacific 1,809 2,57