Defined Benefit Pension Plans Change in Benefit Obligation and Plan Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,700,000	$ 2,512,000	$ 1,980,000
Interest cost	3,625,000	3,754,000	3,490,000
Fair value of plan assets at December 31,	8,561,000
Ending balance at fair value (net pension plan benefit liability)	93,205,000	64,621,000
Defined Benefit Obligation [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at January 1,	72,601,000	71,388,000
Service cost	2,700,000	2,512,000
Interest cost	3,625,000	3,754,000
Actuarial (gain) loss	24,492,000	(597,000)
Benefits paid	(4,131,000)	(4,898,000)
Foreign currency exchange rate changes	2,395,000	(1,338,000)
Other	84,000	1,780,000
Benefit obligation at December 31,	101,766,000	72,601,000
Defined Benefit Plan, Change in Discount Rate	215 basis point
Benefits paid	(4,131,000)	(4,898,000)
Fair Value of Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(227,000)	(516,000)
Fair value of plan assets at January 1,	7,980,000	7,694,000
Actual return on plan assets	225,000	427,000
Company contributions	440,000	520,000
Benefits paid	(227,000)	(516,000)
Foreign currency exchange rate changes	143,000	(145,000)
Fair value of plan assets at December 31,	8,561,000	7,980,000
Ending balance at fair value (net pension plan benefit liability)	$ 93,205,000	$ 64,621,000