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6. Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]                      
Prepaid Taxes $ 14,500               $ 14,500    
U.S.                 72,800 $ (38,500) $ 48,400
International                 25,000 80,100 97,400
Income before income taxes                 97,805 41,560 145,847
U.S. Federal                 6,700 16,100 8,700
State                 3,400 3,100 1,700
International                 32,000 30,400 34,100
Current Income Tax Expense (Benefit)                 42,100 49,600 44,500
U.S. Federal                 (69,800) (42,400) 2,000
State                 4,300 (2,800) 1,400
International                 (19,300) (6,000) (7,100)
Deferred tax benefit                 (84,800) (51,200) (3,700)
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisonal Income Tax Benefit                 125,000    
Non-current tax expense (benefit)                 18,300 17,200 (4,200)
Provision for income taxes (36,800) $ 8,600 $ (3,900) $ 7,700 $ (9,500) $ 5,600 $ 10,300 $ 9,200 $ (24,444) $ 15,560 $ 36,608
U.S. statutory tax rate                 35.00% 35.00% 35.00%
Impact of foreign operations                 7.00% (15.00%) (4.00%)
Foreign dividends, net                 0.00% (40.00%) (4.00%)
Research tax credits                 (4.00%) (9.00%) (2.00%)
Nontaxable subsidies                 (2.00%) (4.00%) (1.00%)
Tax settlements and changes to unrecognized tax benefits                 0.00% 47.00% (3.00%)
Goodwill impairment                 0.00% 11.00% 0.00%
Domestic manufacturing deduction                 0.00% (4.00%) (2.00%)
Stock-based compensation                 (5.00%) (3.00%) (1.00%)
Nondeductible executive compensation                 2.00% 3.00% 1.00%
Fines and penalties                 0.00% 2.00% 0.00%
Prior period adjustments                 0.00% 4.00% 3.00%
State taxes                 3.00% 1.00% 1.00%
Other                 (3.00%) 1.00% 0.00%
Provision for income taxes                 (25.00%) 37.00% 25.00%
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit)                 $ (70,000)    
Bad debt, inventory and warranty accruals 28,600       25,800       28,600 $ 25,800  
Other post-employment benefits, vacation and other reserves 24,000       26,300       24,000 26,300  
Tax credit and net operating loss carryforwards 73,300       96,400       73,300 96,400  
Other 19,700       35,700       19,700 35,700  
Total gross deferred tax assets 145,600       184,200       145,600 184,200  
Valuation allowance (66,400)       (66,400)       (66,400) (66,400)  
Total deferred tax assets 79,200       117,800       79,200 117,800  
Property and equipment 33,500       22,200       33,500 22,200  
Investments and intangible assets 219,100       287,800       219,100 287,800  
Total deferred tax liabilities 252,600       310,000       252,600 310,000  
Net deferred tax liabilities (173,400)       (192,200)       (173,400) (192,200)  
Unrecognized tax benefits period start       $ 21,100       $ 11,900 21,100 11,900 $ 15,800
Additions to tax positions related to prior years                 1,300 10,400 700
Reductions to tax positions related to prior years                 (1,000) 0 (200)
Additions to tax positions related to the current year                 34,800 3,400 2,900
Settlements                 (200) (2,400) (500)
Lapse of statute of limitations                 (3,400) (2,300) (6,300)
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation                 2,300    
Currency translation                   100 500
Unrecognized tax benefits period end 54,900       21,100       54,900 21,100 11,900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 10,900       $ 11,800       10,900 11,800 3,100
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense                 (900) $ 8,700 $ (700)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 2,300               2,300    
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit)                 55,000    
Foreign Tax Authority [Member]                      
Income Taxes [Line Items]                      
Operating Loss Carryforward, Valuation Allowance 27,800               27,800    
Operating Loss Carryforward With No Expiration Date 150,600               150,600    
Operating Loss Carryforwards 207,200               $ 207,200    
Domestic Tax Authority [Member]                      
Income Taxes [Line Items]                      
Other reconciling items                 3.00% 2.00% 0.00%
Tax Cuts and Jobs Act [Member]                      
Income Taxes [Line Items]                      
U.S. tax reform                 (71.00%) 0.00% 0.00%
State and Local Jurisdiction [Member]                      
Income Taxes [Line Items]                      
Operating Loss Carryforwards 53,000               $ 53,000    
Including accrued interest and penalties [Member]                      
Income Taxes [Line Items]                      
Other 2,800               2,800    
Unrecognized tax benefits period end 65,800               65,800    
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member]                      
Income Taxes [Line Items]                      
Deferred Tax Assets, Tax Credit Carryforwards, Research 29,600               $ 29,600    
Acquisition-related Costs [Member]                      
Income Taxes [Line Items]                      
Other reconciling items                 10.00% 0.00% 0.00%
QuantaLife [Member] | Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member]                      
Income Taxes [Line Items]                      
Deferred Tax Assets, Tax Credit Carryforwards, Research 2,000               $ 2,000    
Net of prepaid taxes [Member]                      
Income Taxes [Line Items]                      
Unrecognized tax benefits period end $ 48,500               $ 48,500