Long-Term Debt And Notes Payable (Capitalization Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Long-Term Debt And Notes Payable [Abstract]
Short-term borrowings	$ 1,112	$ 984
Long-term debt	398,914	398,736
Total indebtedness	400,026
Total shareholders' equity	813,553	984,944
Capitalization	$ 1,213,579
Total indebtedness to capitalization	0.33