Retirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Plan [Member]
Defined Contribution Plans Disclosure [Abstract]
Percentage of matching contributions under defined contribution plan	4.00%
Total expense for defined contribution plans	$ 5,400	$ 5,000	$ 4,700
Pension Plans, Defined Benefit [Member]
Benefit obligation [Roll Forward]
Benefit obligation at beginning of year	55,396	72,582
Service cost	2,692	2,523	3,260
Interest cost	1,803	2,390	2,557
Foreign currency exchange rate changes	(2,379)	(1,889)
Benefits paid	(10,708)	(23,726)
Actuarial (gain) loss	(1,173)	5,858
Curtailment gain	(121)	(2,342)
Other	849	0
Benefit obligation at end of year	46,359	55,396	72,582
Change in fair value of plan assets [Roll Forward]
Plan assets at beginning of year	39,520	37,122
Company contributions	10,204	22,402
Foreign currency exchange rate changes	(2,859)	(2,379)
Benefits paid	(10,708)	(23,726)
Actual gain on plan assets	79	6,101
Defined benefit plan, assets for plan benefits at end of year	36,236	39,520	37,122
Funded status	(10,123)	(15,876)
Accumulated benefit obligation	45,217	54,435
Amounts recognized in Consolidated Balance Sheets [Abstract]
Accrued employee and retiree benefits	(14,129)	(18,258)
Other accrued expenses	(5,927)	(7,263)
Prepaid expenses and other current assets	9,933	9,645
Net liability	(10,123)	(15,876)
Components of annual benefit cost [Abstract]
Service cost	2,692	2,523	3,260
Interest cost	1,803	2,390	2,557
Expected return on plan assets	(1,210)	(1,791)	(1,689)
Amortization of prior service cost	0	171	172
Recognized actuarial loss (gain)	228	(305)	3,203
Settlement expense	1,119	1,467	1,177
Curtailment gain	(104)	(754)	0
Defined benefit expense	$ 4,528	$ 3,701	8,680
Weighted average liability assumptions [Abstract]
Discount rate	3.94%	3.70%
Expected return on plan assets	3.40%	3.32%
Rate of compensation increase	0.35%	0.37%
Weighted average cost assumption [Abstract]
Discount rate	3.70%	3.91%
Expected return on plan assets	3.32%	5.12%
Rate of compensation increase	0.37%	4.59%
Amounts recognized in Accumulated Other Comprehensive Income [Abstract]
Unrecognized net actuarial loss	$ 5,725	$ 7,407
Other Comprehensive Income (Loss), Pension Adjustment, Net of Tax [Abstract]
Net actuarial (loss) gain arising during the period	(140)	(387)	3,180
Amortization of actuarial loss, included in defined benefit expense	917	1,252	2,006
Amortization of prior service cost, included in defined benefit expense	0	733	108
Pension adjustment, net of tax	777	1,598	$ 5,294
Estimated Future Benefit Payments [Abstract]
Expected Future Benefit Payments in Year One	7,100
Expected Future Benefit Payments in Year Two	2,000
Expected Future Benefit Payments in Year Three	4,200
Expected Future Benefit Payments in Year Four	1,900
Expected Future Benefit Payments in Year Five	2,100
Expected Future Benefit Payments in Five Fiscal Years Thereafter	15,000
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	6,500
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Expected amortization of actuarial loss in next fiscal year	(300)
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	36,236	39,520
Pension Plans, Defined Benefit [Member] | Level 1 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	6,818	7,422
Pension Plans, Defined Benefit [Member] | Level 2 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	29,418	32,098
Pension Plans, Defined Benefit [Member] | Level 3 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Domestic [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	6,064	6,424
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Domestic [Member] | Level 1 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	6,064	6,424
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Domestic [Member] | Level 2 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Domestic [Member] | Level 3 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Foreign [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	179	242
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Foreign [Member] | Level 1 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	3	0
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Foreign [Member] | Level 2 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	176	242
Pension Plans, Defined Benefit [Member] | Private Equity Funds, Foreign [Member] | Level 3 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
Pension Plans, Defined Benefit [Member] | Fixed Income Funds [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	22,374	22,710
Pension Plans, Defined Benefit [Member] | Fixed Income Funds [Member] | Level 1 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	711	960
Pension Plans, Defined Benefit [Member] | Fixed Income Funds [Member] | Level 2 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	21,663	21,750
Pension Plans, Defined Benefit [Member] | Fixed Income Funds [Member] | Level 3 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
Pension Plans, Defined Benefit [Member] | Other Investments [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	7,619	10,144
Pension Plans, Defined Benefit [Member] | Other Investments [Member] | Level 1 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	40	38
Pension Plans, Defined Benefit [Member] | Other Investments [Member] | Level 2 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	7,579	10,106
Pension Plans, Defined Benefit [Member] | Other Investments [Member] | Level 3 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	$ 0	$ 0