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Debt Obligations (Schedule of Long Term Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
May 28, 2019
Nov. 09, 2018
Debt Instrument [Line Items]        
Total long term obligations $ 1,401,252 $ 1,484,384    
Convertible Debt 204,846 213,461    
Other Long-term Debt 0 11,746    
Less: current portion (29,654) (14,707)    
Total long term obligations, net $ 1,371,598 1,469,677    
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 115.00%      
Unsubordinated term loan [Member]        
Debt Instrument [Line Items]        
Total long term obligations $ 721,406 626,277    
Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Total long term obligations $ 475,000 632,900    
Line of Credit Facility, Maximum Borrowing Capacity   $ 750,000 $ 645,000  
line of credit, increase in maximum borrowing capacity       $ 750,000