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Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 01, 2012 Maximum
Changes in outstanding shares of common stock
Beginning balances (in shares)	20,405,044	20,007,000	19,807,000
Stock issuances
Stock option exercises (in shares)	245,000	332,000	146,000
Restricted stock activity (in shares)	95,000	64,000	54,000
Stock issued in lieu of director retainer (in shares)	2,000	2,000
Ending balances (in shares)	20,747,161	20,405,044	20,007,000
Stockholders' Equity
Authorized amount of stock to be repurchased				$ 20.0

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

Number of share options (or share units) exercised during the current period.