Defined Benefit Pension Plans Change in Benefit Obligation and Plan Assets (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost		$ 4,572,000	$ 3,559,000	$ 4,205,000
Interest cost		2,380,000	3,476,000	3,355,000
Fair value of plan assets at January 1,		10,761,000
Fair value of plan assets at December 31,		9,662,000	10,761,000
Net pension plan benefit liability at fair value		89,105,000	105,417,000
Defined Benefit Obligations [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1,		116,178,000	102,662,000
Service cost		4,572,000	3,559,000
Interest cost		2,380,000	3,476,000
Actuarial (gain) loss		(5,211,000)	(25,838,000)
Benefits paid		(4,382,000)	(5,519,000)
Foreign currency exchange rate changes		(12,190,000)	(13,921,000)
Defined Benefit Plan, Other Changes	[1]	(2,580,000)	83,000
Benefit obligation at December 31,		98,767,000	116,178,000	102,662,000
Fair Value of Plan Assets [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefits paid		(308,000)	(433,000)
Fair value of plan assets at January 1,		10,761,000	11,680,000
Actual return on plan assets		159,000	494,000
Company contributions		671,000	375,000
Foreign currency exchange rate changes		(1,621,000)	(1,355,000)
Fair value of plan assets at December 31,		9,662,000	10,761,000	$ 11,680,000
Net pension plan benefit liability at fair value		$ 89,105,000	$ 105,417,000

[1] Includes impact of curtailments driven by our restructuring activities.