Employee Benefit Plans (Employee Benefits Charged To Operating Expenses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Total employee benefits	$ 52,007	$ 53,875	$ 55,490
Payroll Taxes [Member]
Total employee benefits	20,703	20,226	20,587
Medical Plans [Member]
Total employee benefits	16,350	18,248	20,164
401K Plan [Member]
Total employee benefits	11,728	11,448	9,771
Pension Plans [Member]
Total employee benefits	994	1,815	3,023
Other [Member]
Total employee benefits	$ 2,232	$ 2,138	$ 1,945