Leasing Arrangements (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Capital Leases
2013	$ 1,102,000
2014	1,069,000
2015	1,068,000
2016	1,066,000
2017	1,064,000
2018 and thereafter	5,766,000
Total minimum lease payments	11,135,000
Amounts representing interest	2,593,000
Present value of net minimum lease payments	8,542,000
Operating Leases
2013	6,721,000
2014	4,982,000
2015	4,472,000
2016	4,152,000
2017	3,063,000
2018 and thereafter	14,992,000
Total minimum lease payments	38,382,000
Leasing Arrangements (Textual) [Abstract]
Operating lease term maximum	25 years
Operating lease expense	$ 9,000,000	$ 8,900,000	$ 9,900,000