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Balance Sheet Account Detail (Financial Instruments Not Recorded at Fair Value on a Recurring Basis) (Details) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Aug. 09, 2018
Nov. 02, 2015
Debt Instrument [Line Items]        
Carrying value $ 165,024 $ 198,078    
Fair value 228,643 168,626    
Term loan facility        
Debt Instrument [Line Items]        
Carrying value 124,647 117,880    
Fair value 154,734 116,916    
Convertible notes        
Debt Instrument [Line Items]        
Carrying value 36,096 75,917    
Fair value 72,434 50,489    
Other debt        
Debt Instrument [Line Items]        
Carrying value 4,281 4,281    
Fair value $ 1,475 $ 1,221    
Convertible Senior Notes Due 2020        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate     3.25%  
Convertible Senior Notes Due 2020 | Convertible notes        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate       3.25%