Employee Benefit Plans (Employee Benefits Charged To Operating Expenses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Total employee benefits	$ 58,224	$ 52,007	$ 53,875
Payroll Taxes [Member]
Total employee benefits	21,247	20,703	20,226
Medical Plans [Member]
Total employee benefits	19,861	16,350	18,248
401K Plan [Member]
Total employee benefits	12,613	11,728	11,448
Pension Plans [Member]
Total employee benefits	2,441	994	1,815
Other [Member]
Total employee benefits	$ 2,062	$ 2,232	$ 2,138