Commitments And Contingencies Operating Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leased Assets [Line Items]
Rent expense	$ 17,500,000	$ 16,600,000	$ 16,900,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Year 1	18,858,000
Year 2	16,752,000
Year 3	13,689,000
Year 4	9,024,000
Year 5	7,038,000
Thereafter	4,900,000
Total	70,261,000
Future Minimum Sublease Income Receivable [Abstract]
Year 1	670,000
Year 2	348,000
Year 3	59,000
Year 4	15,000
Year 5	0
Thereafter	0
Total	1,092,000
Facility Closing [Member]
Operating Leased Assets [Line Items]
Rent expense	200,000	100,000	400,000
Related Party [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Year 1	7,641,000
Year 2	7,631,000
Year 3	6,981,000
Year 4	5,121,000
Year 5	4,963,000
Thereafter	3,380,000
Total	35,717,000
Non-Related Party [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Year 1	11,217,000
Year 2	9,121,000
Year 3	6,708,000
Year 4	3,903,000
Year 5	2,075,000
Thereafter	1,520,000
Total	34,544,000
Accrued Liabilities [Member] | Facility Closing [Member]
Operating Leased Assets [Line Items]
Accrued Rent	$ 1,200,000	$ 1,400,000