Leases (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Leases
Lease Expiration Date	Dec. 31, 2031
Capital Leased Assets, Gross	$ 16,219,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	4,243,000
Operating Leases, Rent Expense, Net	$ 47,278,000	$ 42,413,000	$ 37,301,000