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Debt Obligations (Schedule of Long Term Obligations) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Nov. 09, 2018
Mar. 31, 2018
Debt Instrument [Line Items]        
Total long term obligations $ 1,451,537 $ 1,401,252    
Convertible Debt 211,278 204,846    
Other Long-term Debt 11,841     $ 0
Less: current portion (43,451) (29,654)    
Total long term obligations, net $ 1,408,086 1,371,598    
Senior Notes 2nd Term Loan [Member]        
Debt Instrument [Line Items]        
Total long term obligations     $ 675,000  
Unsubordinated term loan and Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Collateral, Coverage Percentage 102.00%      
Unsubordinated term loan [Member]        
Debt Instrument [Line Items]        
Total long term obligations $ 698,418 721,406    
Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Accordion Feature Amount     300,000  
Total long term obligations $ 530,000 $ 475,000    
line of credit, increase in maximum borrowing capacity     $ 500,000