Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Leases
Rent expense	$ 17,600,000	$ 21,000,000	$ 23,000,000
Future minimum rental commitments for all non-cancellable operating leases
2013	15,689,000
2014	12,762,000
2015	7,884,000
2016	5,510,000
2017	3,937,000
After 2017	3,491,000
Total	49,273,000
Capital lease obligations
Current portion of capital leases	369,000	402,000
Long-term portion of capital leases	302,000	305,000
Total capital lease obligations	671,000	707,000
Future minimum lease payments for all capital leases
2013	369,000
2014	212,000
2015	73,000
2016	16,000
2017	1,000
After 2017	0
Total	$ 671,000