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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