Financial Instruments (Carrying Value, Fair Value And Hierarchy Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual fund investments of deferred compensation plans held in trust, Carrying Value	$ 40,583	$ 36,089
Current portion of long-term debt	179,154
Long-term debt, Carrying Value		174,890
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual fund investments of deferred compensation plans held in trust	40,583	36,089
Long-term debt	$ 199,041	$ 197,874