Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Leases [Abstract]
Remaining term of operating leases (in years)	6 years
Total rental expense under operating leases	$ 4,800,000		$ 5,400,000	$ 6,300,000
Minimum future operating lease payments [Abstract]
2013	4,377,000
2014	1,931,000
2015	497,000
2016	306,000
2017 and thereafter	174,000
Total	7,285,000	[1]
Minimum future sublease rentals	$ 38,000

[1] Minimum payments have not been reduced by minimum sublease rentals of $38 thousand due in the future under noncancelable subleases.