Estimated Average Membership Life Enrollment Fees are Deferred and Recognized on Straight-line Basis

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Amount of interest capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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Amount of the cost of borrowed funds accounted for as interest expense.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

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-Topic 942

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-Section S99

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-Subparagraph (SX 210.9-04.9)

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-Name Regulation S-X (SX)

-Number 210

-Section 04

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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Primarily represents commissions incurred in the period based upon the sale by commissioned employees or third parties of the entity's goods or services, and fees for sales assistance or product enhancements performed by third parties (such as a distributor or value added reseller).

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

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-Name Regulation S-X (SX)

-Number 210

-Section 03

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SX 210.5-02.2)

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-Name Regulation S-X (SX)

-Number 210

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Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 segment	Dec. 31, 2013	Dec. 31, 2012
Summary of Significant Accounting Policies (Details) [Line Items]
Number of Operating Segments	1us-gaap_NumberOfOperatingSegments
Short-term investments	$ 24,268,000us-gaap_ShortTermInvestments	$ 21,055,000us-gaap_ShortTermInvestments
Interest Costs Incurred	2,613,000us-gaap_InterestCostsIncurred
Interest expense, net	1,203,000us-gaap_InterestExpense	1,868,000us-gaap_InterestExpense	1,856,000us-gaap_InterestExpense
Interest Costs Capitalized	1,410,000us-gaap_InterestCostsCapitalized	0us-gaap_InterestCostsCapitalized	0us-gaap_InterestCostsCapitalized
Sales Commissions and Fees	11,378,000us-gaap_SalesCommissionsAndFees	9,395,000us-gaap_SalesCommissionsAndFees
Minimum [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	25 years
eCommerce [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
e-Commerce Sales Revenue	$ 27,133,000	$ 22,062,000	$ 14,475,000
Annual or Multi-Year Members [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Estimated Average Membership Life Enrollment Fees are Deferred and Recognized on Straight-line Basis	80 months
Monthly Members [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Estimated Average Membership Life Enrollment Fees are Deferred and Recognized on Straight-line Basis	13 months