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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense | $ 1,913 | $ 9,731 | $ 10,881 | $ 16,891
Effective tax rate (percent) | 6.10% | 45.70% | 9.30% | 514.50%
Deferred tax benefit from release of valuation allowance | $ 4,000 |  | $ 4,000 |
Tax benefit from prior period tax matters |  |  | 2,100 |
Deferred tax asset related to a reserve for an uncertain tax position | 3,000 |  | 3,000 |
Other Tax Expense (Benefit) | $ 2,100 |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount |  |  |  | $ 23,900
Caisson Interventional LLC |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Non-taxable gain recognized in remeasurement of existing equity investment |  |  | 38,100 |
Deferred tax benefit recognized associated with certain temporary differences arising from Mergers |  |  | $ 3,900 |
Her Majesty's Revenue and Customs (HMRC) and Ministry of the Economy | Foreign Tax Authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount |  | $ 58,700 |  |

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