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Stock-Based Compensation (Details 12) (Common Stock [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Common Stock [Member]
Summary of weighted average grant-date fair value of the common stock awarded and cash used to settle the company's obligation under the deferred compensation
Granted, shares	7	6
Weighted average grant-date fair value	$ 15.80	$ 19.77
Fair value of vested	$ 76	$ 107
Cash used to settle the company's obligation	$ 161

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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