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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 |  |

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