Operating Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases [Abstract]
Rental expense for all non-cancelable operating leases	$ 18,100,000	$ 18,600,000	$ 18,600,000
Future minimum rentals under operating leases:
Future minimum operating lease payments due, 2014	15,070,000
Future minimum operating lease payments due, 2015	10,101,000
Future minimum operating lease payments due, 2016	8,487,000
Future minimum operating lease payments due, 2017	8,227,000
Future minimum operating lease payments due, 2018	7,917,000
Future minimum operating lease payments due, 2019 and thereafter	$ 33,865,000