Description of Business and Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2012
Description of Business and Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Our Condensed Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) and, in the opinion of management, include all adjustments necessary for a fair presentation of our financial position, results of operations, and cash flows for each period presented. These adjustments are of a normal and recurring nature unless otherwise disclosed herein. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) have been condensed or omitted pursuant to SEC rules and regulations. We derived the Condensed Consolidated Balance Sheet as of December 31, 2011 from audited financial statements, but did not include all disclosures required by U.S. GAAP. These Condensed Consolidated Financial Statements should be read in conjunction with our 2011 Annual Report on Form 10-K. Operating results for the three and six month periods ended June 30, 2012 are not necessarily indicative of the results expected in subsequent quarters or for the year ending December 31, 2012.
Use of Estimates	Use of Estimates The preparation of our Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Significant items that are subject to such estimates and assumptions include investment valuation, allowance for doubtful accounts against patient receivables, insurance reserves, income taxes and enhancement accruals. Although management bases its estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, actual results could differ significantly from the estimates under different assumptions or conditions.
Reclassifications	Reclassifications We have reclassified certain prior-period amounts in the Condensed Consolidated Balance Sheets and Statements of Cash Flows to conform to current period presentation. The reclassifications were not material to the Condensed Consolidated Financial Statements.
Patient Receivables and Allowance for Doubtful Accounts	Patient Receivables and Allowance for Doubtful Accounts We provide financing to some of our patients, including those who could not otherwise obtain third-party financing. The terms of the financing usually require the patient to pay an up-front fee which is intended to cover some or all of our variable costs, and then generally we deduct the remainder automatically from the patient’s bank account over a period of 12 to 36 months. We have recorded an allowance for doubtful accounts as a best estimate of the amount of probable credit losses from our patient financing program. Each month, we review the allowance and adjust the allowance based upon our own experience with patient financing. We charge-off receivables against it when it is probable that a receivable will not be recovered. Our policy is to reserve for all patient receivables that remain open past their financial maturity date and to provide reserves for patient receivables prior to the maturity date so as to bring patient receivables, net of reserves, down to the estimated net realizable value based on historical collectability rates, recent default activity and the current credit environment. Receivable balances that remain open past their financial maturity amounted to $129,000 and $160,000 at June 30, 2012 and December 31, 2011, respectively. We maintained an allowance for doubtful accounts on our patient receivables of $1.8 million and $1.7 million, respectively, at June 30, 2012 and December 31, 2011. During the three and six months ended June 30, 2012, we wrote-off $199,000 and $415,000, respectively, of receivables against the allowance for doubtful accounts and recovered $32,000 and $62,000, respectively, in receivables previously written off. During the three and six months ended June 30, 2011, we wrote-off $172,000 and $366,000, respectively, of receivables against the allowance for doubtful accounts and recovered $39,000 and $87,000, respectively, in receivables previously written off.

Description of Business and Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2012

Description of Business and Accounting Policies [Abstract]

Basis of Presentation

Our Condensed Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) and, in the opinion of management, include all adjustments necessary for a fair presentation of our financial position, results of operations, and cash flows for each period presented. These adjustments are of a normal and recurring nature unless otherwise disclosed herein. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) have been condensed or omitted pursuant to SEC rules and regulations.

We derived the Condensed Consolidated Balance Sheet as of December 31, 2011 from audited financial statements, but did not include all disclosures required by U.S. GAAP. These Condensed Consolidated Financial Statements should be read in conjunction with our 2011 Annual Report on Form 10-K. Operating results for the three and six month periods ended June 30, 2012 are not necessarily indicative of the results expected in subsequent quarters or for the year ending December 31, 2012.

Use of Estimates

Use of Estimates

The preparation of our Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Significant items that are subject to such estimates and assumptions include investment valuation, allowance for doubtful accounts against patient receivables, insurance reserves, income taxes and enhancement accruals. Although management bases its estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, actual results could differ significantly from the estimates under different assumptions or conditions.

Reclassifications

Reclassifications

We have reclassified certain prior-period amounts in the Condensed Consolidated Balance Sheets and Statements of Cash Flows to conform to current period presentation. The reclassifications were not material to the Condensed Consolidated Financial Statements.

Patient Receivables and Allowance for Doubtful Accounts

Patient Receivables and Allowance for Doubtful Accounts

We provide financing to some of our patients, including those who could not otherwise obtain third-party financing. The terms of the financing usually require the patient to pay an up-front fee which is intended to cover some or all of our variable costs, and then generally we deduct the remainder automatically from the patient’s bank account over a period of 12 to 36 months. We have recorded an allowance for doubtful accounts as a best estimate of the amount of probable credit losses from our patient financing program. Each month, we review the allowance and adjust the allowance based upon our own experience with patient financing. We charge-off receivables against it when it is probable that a receivable will not be recovered. Our policy is to reserve for all patient receivables that remain open past their financial maturity date and to provide reserves for patient receivables prior to the maturity date so as to bring patient receivables, net of reserves, down to the estimated net realizable value based on historical collectability rates, recent default activity and the current credit environment. Receivable balances that remain open past their financial maturity amounted to $129,000 and $160,000 at June 30, 2012 and December 31, 2011, respectively.

We maintained an allowance for doubtful accounts on our patient receivables of $1.8 million and $1.7 million, respectively, at June 30, 2012 and December 31, 2011. During the three and six months ended June 30, 2012, we wrote-off $199,000 and $415,000, respectively, of receivables against the allowance for doubtful accounts and recovered $32,000 and $62,000, respectively, in receivables previously written off. During the three and six months ended June 30, 2011, we wrote-off $172,000 and $366,000, respectively, of receivables against the allowance for doubtful accounts and recovered $39,000 and $87,000, respectively, in receivables previously written off.

- Definition

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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