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Stock-Based Compensation (Schedule of Value Appreciation Rights Activity) (Details) (USD $)
In Thousands, except Per Share data
6 Months Ended
Jun. 30, 2011
Value Appreciation Rights [Member]
 
Outstanding, beginning of year 11,569
Exercised (824)
Cancelled/Forfeited (27)
Outstanding, June 30, 2011 10,718
Weighted Average Exercise Price Value Appreciation Rights [Member]
 
Outstanding, beginning of year 13.11
Exercised 13.88
Cancelled/Forfeited 15.35
Outstanding, June 30, 2011 13.04