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Stock Options and Other Equity-Based Incentive Instruments (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Information about options
Intrinsic value of options exercised	$ 138,000	$ 2,087,000	$ 1,429,000
Fair value of options that vested	1,083,000	830,000	800,000
Total compensation costs for options recognized in income	1,083,000	830,000	800,000
Total tax benefit recognized in income related to compensation costs for options	$ 455,000	$ 349,000	$ 336,000
Weighted average fair value of grants (per option)	$ 6.63	$ 6.27	$ 7.93

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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