Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash dividends per share (in dollars per share)	$ 0.84	$ 0.79	$ 0.76
Accumulated Other Comprehensive Income (Loss) [Member]
Tax, Unrealized gain/loss on cash flow hedges, arising during the period	$ 356	$ 90	$ 118
Tax, Reclassification adjustment for cash low hedges included in net income	272	41	141
Tax, Pension adjustment	2,536	504	3,329
Total Comprehensive Income [Member]
Tax, Unrealized gain/loss on cash flow hedges, arising during the period	356	90	118
Tax, Reclassification adjustment for cash low hedges included in net income	272	41	141
Tax, Pension adjustment	$ 2,536	$ 504	$ 3,329

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.

+ References+ Details

The tax effect of the amount of the change in the additional minimum pension liability not yet recognized pursuant to FAS 87 as a net periodic pension cost. If the additional pension liability required to be recognized exceeds the unrecognized prior service costs, then the excess (which is the net loss not yet recognized as net periodic pension cost) is to be recorded as a separate component in other comprehensive income, before adjusting for tax effects. In a subsequent measurement, the elimination or adjustment to the amount of the minimum pension liability recorded in accumulated other comprehensive income is included in this line. Eliminated upon adoption of FAS 158.

+ References+ Details

- Definition

Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

+ References+ Details