Employee Benefit Plans (Employee Benefits Charged To Operating Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Total employee benefits	$ 66,470	$ 60,180	$ 61,469
Payroll Taxes [Member]
Total employee benefits	23,210	22,235	21,417
Medical Plans [Member]
Total employee benefits	25,497	20,659	22,855
401K Plan [Member]
Total employee benefits	13,562	12,841	12,057
Pension Plans [Member]
Total employee benefits	987	1,495	2,555
Other [Member]
Total employee benefits	$ 3,214	$ 2,950	$ 2,585