Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2013
Use of Estimates in Preparation of Financial Statements	Use of Estimates in Preparation of Financial Statements. The preparation of the accompanying Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of our Financial Statements, and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.
Reclassifications	Reclassifications. Certain 2012 amounts have been reclassified to conform to the September 30, 2013 presentation.
Postage	Postage. We pass through to our clients the cost of postage that is incurred on behalf of those clients, and typically require an advance payment on expected postage costs. These advance payments are included in “Client deposits” in the accompanying Condensed Consolidated Balance Sheets (the “Balance Sheet” or “Balance Sheets”) and are classified as current liabilities regardless of the contract period. We net the cost of postage against the postage reimbursements for those clients where we require advance deposits, and include the net amount in processing and related services revenues.
Cash and Cash Equivalents	Cash and Cash Equivalents. We consider all highly liquid investments with original maturities of three months or less at the date of the purchase to be cash equivalents. As of September 30, 2013, our cash equivalents consist primarily of institutional money market funds, commercial paper, and time deposits held at major banks. As of September 30, 2013, we had $4.9 million of restricted cash that serves to collateralize outstanding letters of credit. This restricted cash is included in “Cash and cash equivalents” in our Balance Sheet.
Short-term Investments and Other Financial Instruments	Short-term Investments and Other Financial Instruments. Our financial instruments as of September 30, 2013 include cash and cash equivalents, short-term investments, accounts receivable, accounts payable, interest rate swap contracts, and debt. Because of their short maturities, the carrying amounts of cash equivalents, accounts receivable, and accounts payable approximate their fair value. Our short-term investments and certain of our cash equivalents are considered “available-for-sale” and are reported at fair value in our Balance Sheets, with unrealized gains and losses, net of the related income tax effect, excluded from earnings and reported in a separate component of stockholders’ equity. Realized and unrealized gains and losses were not material in any period presented. All short-term investments held by us as of September 30, 2013 and December 31, 2012 have contractual maturities of less than two years. Proceeds from the sale/maturity of short-term investments for the nine months ended September 30, 2013 and 2012 were $62.7 million and $33.2 million, respectively.
Income Taxes	Income Taxes. During the third quarter of 2013, we recognized incremental research and development (“R&D”) tax credits claimed for development activities from previous years and the reduction of certain tax allowances related to foreign operations. The benefit of these events is reflected in our results of operations for the three and nine months ended September 30, 2013. Additionally, during the first quarter of 2013, we recognized an income tax benefit related to R&D tax credits that we generated during 2012. As a result of the American Taxpayer Relief Act of 2012 being signed into law on January 2, 2013, we were unable to include these credits in our 2012 results of operations, as a change in tax law is accounted for in the period of enactment. Thus, the benefit of these credits is reflected in our results of operations for the nine months ended September 30, 2013.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2013

Use of Estimates in Preparation of Financial Statements

Use of Estimates in Preparation of Financial Statements. The preparation of the accompanying Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of our Financial Statements, and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.

Reclassifications

Reclassifications. Certain 2012 amounts have been reclassified to conform to the September 30, 2013 presentation.

Postage

Postage. We pass through to our clients the cost of postage that is incurred on behalf of those clients, and typically require an advance payment on expected postage costs. These advance payments are included in “Client deposits” in the accompanying Condensed Consolidated Balance Sheets (the “Balance Sheet” or “Balance Sheets”) and are classified as current liabilities regardless of the contract period. We net the cost of postage against the postage reimbursements for those clients where we require advance deposits, and include the net amount in processing and related services revenues.

Cash and Cash Equivalents

Cash and Cash Equivalents. We consider all highly liquid investments with original maturities of three months or less at the date of the purchase to be cash equivalents. As of September 30, 2013, our cash equivalents consist primarily of institutional money market funds, commercial paper, and time deposits held at major banks.

As of September 30, 2013, we had $4.9 million of restricted cash that serves to collateralize outstanding letters of credit. This restricted cash is included in “Cash and cash equivalents” in our Balance Sheet.

Short-term Investments and Other Financial Instruments

Short-term Investments and Other Financial Instruments. Our financial instruments as of September 30, 2013 include cash and cash equivalents, short-term investments, accounts receivable, accounts payable, interest rate swap contracts, and debt. Because of their short maturities, the carrying amounts of cash equivalents, accounts receivable, and accounts payable approximate their fair value.

Our short-term investments and certain of our cash equivalents are considered “available-for-sale” and are reported at fair value in our Balance Sheets, with unrealized gains and losses, net of the related income tax effect, excluded from earnings and reported in a separate component of stockholders’ equity. Realized and unrealized gains and losses were not material in any period presented.

All short-term investments held by us as of September 30, 2013 and December 31, 2012 have contractual maturities of less than two years. Proceeds from the sale/maturity of short-term investments for the nine months ended September 30, 2013 and 2012 were $62.7 million and $33.2 million, respectively.

Income Taxes

Income Taxes. During the third quarter of 2013, we recognized incremental research and development (“R&D”) tax credits claimed for development activities from previous years and the reduction of certain tax allowances related to foreign operations. The benefit of these events is reflected in our results of operations for the three and nine months ended September 30, 2013.

Additionally, during the first quarter of 2013, we recognized an income tax benefit related to R&D tax credits that we generated during 2012. As a result of the American Taxpayer Relief Act of 2012 being signed into law on January 2, 2013, we were unable to include these credits in our 2012 results of operations, as a change in tax law is accounted for in the period of enactment. Thus, the benefit of these credits is reflected in our results of operations for the nine months ended September 30, 2013.

- Definition

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

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- Definition

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

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