Qualified Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Qualified Employee Benefit Plans [Abstract]
Defined contribution expense for foreign entities	$ 1,600,000	$ 2,000,000	$ 5,200,000	$ 5,900,000
Estimated future contributions, current fiscal year	4,900,000		4,900,000
Net expense (benefit) under the Retirement Plan [Abstract]
Interest cost on projected benefit obligations	1,139,000	1,133,000	3,493,000	3,493,000
Expected return on plan assets	(1,231,000)	(1,272,000)	(3,737,000)	(3,860,000)
Recognized actuarial loss	208,000	92,000	642,000	308,000
Amortization of transition asset	(36,000)	(36,000)	(108,000)	(108,000)
Net pension charge (benefit)	$ 80,000	$ (83,000)	$ 290,000	$ (167,000)