Pension And Other Retirement Benefit Plans (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Pension And Other Retirement Benefit Plans [Abstract]
Multi-employer plan number			333
Pension expense	$ 275,000	$ 212,000	$ 550,000	$ 424,000
Cash contributions to multi-employer plan			842,000
Expected contributions to be paid in the next fiscal year					246,000
Contributions paid in current fiscal year			136,000
Expected contributions to be paid during remainder of fiscal year	$ 121,000		$ 121,000