Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Fair value of financial assets and liabilities
Maturity period of cash equivalents to classify as money market funds, maximum	3 months
Transfers of assets from level 1 to level 2 of fair value hierarchy	$ 0
Transfers of assets from level 2 to level 1 of fair value hierarchy	0
Recurring basis \| Estimate Of Fair Value Fair Value Disclosure
Financial Liabilities:
Debt	205,000	220,000
Recurring basis \| Estimate Of Fair Value Fair Value Disclosure \| Money Market Funds
Financial Assets:
Cash and cash equivalents	705	5,013
Recurring basis \| Estimate Of Fair Value Fair Value Disclosure \| U.S. government debt securities
Financial Assets:
Investment, at fair value	730	1,341
Recurring basis \| Estimate Of Fair Value Fair Value Disclosure \| Corporate debt securities
Financial Assets:
Investment, at fair value	2,903	7,970
Recurring basis \| Estimate Of Fair Value Fair Value Disclosure \| Municipal bonds
Financial Assets:
Cash and cash equivalents, and short-term investments	663	669
Recurring basis \| Level 1 \| Money Market Funds
Financial Assets:
Cash and cash equivalents	705	5,013
Recurring basis \| Level 2
Financial Liabilities:
Debt	205,000	220,000
Recurring basis \| Level 2 \| U.S. government debt securities
Financial Assets:
Investment, at fair value	730	1,341
Recurring basis \| Level 2 \| Corporate debt securities
Financial Assets:
Investment, at fair value	2,903	7,970
Recurring basis \| Level 2 \| Municipal bonds
Financial Assets:
Cash and cash equivalents, and short-term investments	$ 663	$ 669

Represents the maximum maturity period of cash equivalents to be classified as money market funds.

No definition available.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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- Definition

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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