Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful notes receivable	$ 49	$ 47
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000us-gaap_CommonStockSharesAuthorized	200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares)	25,393,433us-gaap_CommonStockSharesIssued	25,393,433us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares)	24,054,913us-gaap_CommonStockSharesOutstanding	24,464,163us-gaap_CommonStockSharesOutstanding
Treasury stock (in shares)	1,338,520us-gaap_TreasuryStockShares	929,270us-gaap_TreasuryStockShares

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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