Employee Benefits (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amounts recognized in the Consolidated Balance Sheets consist of:
Non-current liabilities	$ (28,188,000)	$ (50,312,000)
Amounts recognized in Accumulated Other Comprehensive Income (Loss) consist of:
Accumulated benefit obligations	212,200,000	218,600,000
Components of net periodic benefit cost (credit)
Amortization of prior service cost		3,200,000
Settlement loss	(200,000)
Pension Benefits
Pension and Post Retirement Plans
Costs included in benefit obligation	216,306,000	223,780,000	201,168,000
Change in benefit obligation:
Benefit obligation at beginning of period	223,780,000	201,168,000
Service cost	1,401,000	1,246,000	1,449,000
Interest cost	7,380,000	8,159,000	8,583,000
Plan participants' contributions	1,567,000	1,524,000
Actuarial loss (gain)	(12,208,000)	18,917,000
Foreign currency impact	2,463,000	2,931,000
Benefits and administrative expenses paid	(7,760,000)	(6,949,000)
Settlements	(628,000)
Acquisitions	311,000
Plan amendment and other changes		(3,216,000)
Benefit obligation at end of period	216,306,000	223,780,000	201,168,000
Change in plan assets:
Fair value of plan assets at beginning of period	176,693,000	155,840,000
Actual return on plan assets	18,233,000	15,879,000
Employer contribution	2,732,000	7,816,000
Plan participants' contributions	1,567,000	1,524,000
Foreign currency impact	2,592,000	2,583,000
Benefits and administrative expenses paid	(7,760,000)	(6,949,000)
Settlements	(628,000)
Fair value of plan assets at end of period	193,429,000	176,693,000	155,840,000
Funded status of plans	(22,877,000)	(47,087,000)
Amounts recognized in the Consolidated Balance Sheets consist of:
Non-current assets	4,023,000	1,451,000
Current liabilities	(232,000)	(232,000)
Non-current liabilities	(26,668,000)	(48,306,000)
Net deficit recognized in Consolidated Balance Sheets	(22,877,000)	(47,087,000)
Amounts recognized in Accumulated Other Comprehensive Income (Loss) consist of:
Net actuarial (loss) gain	(50,580,000)	(74,652,000)
Transition asset	850,000	1,106,000
Prior service credit	3,232,000	3,552,000
Accumulated other comprehensive (loss) income	(46,498,000)	(69,994,000)
Accumulated contributions in excess of net periodic benefit cost	23,621,000	22,907,000
Net deficit recognized in Consolidated Balance Sheets	(22,877,000)	(47,087,000)
Pension plans where the projected benefit obligations exceeded the fair value of plan assets
Projected benefit obligations	128,638,000	216,861,000
Fair value of plan assets	101,738,000	168,322,000
Excess of projected benefit obligations over plan assets	26,900,000	48,539,000
Pension plans where the accumulated benefit obligations exceeded the fair value of plan assets
Accumulated benefit obligations	127,692,000	211,047,000
Fair value of plan assets	101,145,000	167,241,000
Excess of accumulated benefit obligations over plan assets	26,547,000	43,806,000
Components of net periodic benefit cost (credit)
Service cost	1,401,000	1,246,000	1,449,000
Interest cost	7,380,000	8,159,000	8,583,000
Expected return on plan assets	(9,464,000)	(9,495,000)	(10,089,000)
Amortization of prior service cost	(393,000)	(54,000)	(58,000)
Amortization of transition asset	(272,000)	(269,000)	(284,000)
Settlement loss	229,000
Amortization of (gain) loss	3,223,000	2,417,000	1,794,000
Net periodic benefit cost	2,104,000	2,004,000	1,395,000
Foreign pension plans
Pension and Post Retirement Plans
Costs included in benefit obligation	106,700,000	104,300,000
Discount rate used for determining benefit obligations in the postretirement benefits plans (as a percent)	2.75%	2.34%
Change in benefit obligation:
Benefit obligation at beginning of period	104,300,000
Benefit obligation at end of period	106,700,000	104,300,000
Change in plan assets:
Fair value of plan assets at beginning of period	94,800,000
Fair value of plan assets at end of period	105,800,000	94,800,000
Components of net periodic benefit cost (credit)
Net periodic benefit cost	1,400,000	1,900,000	1,800,000
Post Retirement Benefits
Pension and Post Retirement Plans
Costs included in benefit obligation	1,769,000	2,312,000	2,429,000
Discount rate used for determining benefit obligations in the postretirement benefits plans (as a percent)	5.13%	4.21%
Decrease in accumulated postretirement benefit obligation on account of change in discount rate	200,000
Change in benefit obligation:
Benefit obligation at beginning of period	2,312,000	2,429,000
Service cost	18,000	18,000	18,000
Interest cost	92,000	111,000	138,000
Plan participants' contributions	375,000	422,000
Actuarial loss (gain)	(452,000)	30,000
Benefits and administrative expenses paid	(604,000)	(698,000)
Acquisitions	28,000
Benefit obligation at end of period	1,769,000	2,312,000	2,429,000
Change in plan assets:
Employer contribution	229,000	276,000
Plan participants' contributions	375,000	422,000
Benefits and administrative expenses paid	(604,000)	(698,000)
Funded status of plans	(1,769,000)	(2,312,000)
Amounts recognized in the Consolidated Balance Sheets consist of:
Current liabilities	(131,000)	(306,000)
Non-current liabilities	(1,638,000)	(2,006,000)
Net deficit recognized in Consolidated Balance Sheets	(1,769,000)	(2,312,000)
Amounts recognized in Accumulated Other Comprehensive Income (Loss) consist of:
Net actuarial (loss) gain	724,000	277,000
Prior service credit		254,000
Accumulated other comprehensive (loss) income	724,000	531,000
Accumulated contributions in excess of net periodic benefit cost	(2,493,000)	(2,843,000)
Net deficit recognized in Consolidated Balance Sheets	(1,769,000)	(2,312,000)
Components of net periodic benefit cost (credit)
Service cost	18,000	18,000	18,000
Interest cost	92,000	111,000	138,000
Amortization of prior service cost	(254,000)	(353,000)	(353,000)
Amortization of (gain) loss	(5,000)	(7,000)
Net periodic benefit cost	$ (149,000)	$ (231,000)	$ (197,000)