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Concolidated Statement of Changes in Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement of Changes in Shareholders' Equity [Abstract]
Cash dividends on common stock (in dollars per share)	$ 1.728	$ 1.728	$ 1.728
Common stock issued (in shares)	102,404	20,513,492	4,655,565
Other comprehensive income, deferred tax benefit	$ 361	$ 111	$ 0

Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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