Pensions, Other Post Retirement and Post Employment Benefits - Funded Status and Changes in Benefit Obligation and Plan Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Change in benefit obligation
Administrative expenses paid	$ (511)		$ (665)
Change in plan assets
Amounts recorded in accrued liabilities	3,568		3,803
Accumulated benefit obligation	167,679		152,988
Projected benefit obligation	178,165		135,102
Accumulated benefit obligation	167,679		130,110
Fair value of plan assets	97,479		69,322
Defined Benefit Plans
Change in benefit obligation
Benefit obligation at beginning of year	161,101		168,736
Service cost	3,532		3,633		3,867
Interest cost	6,483		6,221		6,708
Plan participants’ contributions	101		108
Actuarial loss (gain)	27,965		(9,534)
Currency translation impact	(10,583)		272
Settlement/curtailment	(694)		(716)
Benefits paid	(9,229)		(6,954)
Benefit obligation at end of year	178,165		161,101		168,736
Change in plan assets
Fair value of plan assets at beginning of year	93,550		84,212
Actual return on plan assets	10,493		10,288
Employer contributions	8,168		8,076
Plan participants’ contributions	101		108
Settlement/curtailment	(694)		(716)
Administrative expenses paid	(511)		(665)
Currency translation impact	(4,398)		(799)
Benefits paid	(9,229)		(6,954)
Fair value of plan assets at end of year	97,480		93,550		84,212
Funded status	$ (80,685)	[1]	$ (67,551)	[1]

[1] In accordance with Topic 715, $3,568 and $3,803 of this amount is recorded in accrued expenses as of December 31, 2014 and 2013, respectively.