Leases and Commitments (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Capital Leased Assets [Line Items]
Lease Expense	$ 24,391,000	$ 24,377,000	$ 20,966,000
Capital Leases - Next Twelve Months	1,443,000
Operating Leases - Next Twelve Months	21,266,000
Capital Leases - Due in Two Years	1,386,000
Operating Leases - Due in Two Years	14,043,000
Capital Leases - Due in Three Years	1,375,000
Operating Leases - Due in Three Years	9,297,000
Capital Leases - Due in Four Years	1,372,000
Operating Leases - Due in Four Years	5,004,000
Capital Leases - Due in Five Years	1,366,000
Operating Leases - Due in Five Years	3,820,000
Capital Leases - Thereafter	2,216,000
Operating Leases - Thereafter	3,309,000
Total future minimum lease payments	9,158,000
Total future minimum lease payments	56,739,000
Amounts representing interest	(1,967,000)
Present value of minimum lease payments	7,191,000
Minimum [Member]
Capital Leased Assets [Line Items]
Lease Term	1 year
Maximum [Member]
Capital Leased Assets [Line Items]
Lease Term	20 years
Building and Equipment [Member]
Capital Leased Assets [Line Items]
Capital Leased Assets, Gross	14,416,000	14,643,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	$ 6,982,000	$ 5,914,000