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Summary of Significant Accounting Policies - Net Income per Common Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Anti-dilutive common stock equivalents related to options and restricted stock awards excluded from fully diluted calculation	766	784	545
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average common shares outstanding—basic	15,625	15,420	15,144
Dilutive common shares issuable in connection with stock plans	209	185	197
Weighted average common shares outstanding—diluted	15,834	15,605	15,341

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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