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Debt Obligations (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2017
Dec. 31, 2018
Nov. 09, 2018
May 10, 2018
Sep. 25, 2017
Debt Instrument [Line Items]            
Long term obligations $ 1,451,537   $ 1,401,252      
Debt Issuance Costs, Line of Credit Arrangements, Net 8,900   9,800      
Convertible Debt $ 211,278   204,846      
Senior Notes 2nd Term Loan [Member]            
Debt Instrument [Line Items]            
Long term obligations       $ 675,000    
Variable interest rate 4.30%          
Unsubordinated term loan and Revolving credit facility [Member]            
Debt Instrument [Line Items]            
Collateral coverage percentage 102.00%          
Maximum amount of common stock authorized for repurchase $ 100,000          
Unsubordinated term loan [Member]            
Debt Instrument [Line Items]            
Long term obligations $ 698,418   721,406      
Variable interest rate 4.30%          
Revolving credit facility [Member]            
Debt Instrument [Line Items]            
Long term obligations $ 530,000   475,000      
Accordion feature amount       $ 300,000    
Line of Credit Facility, Maximum Borrowing Capacity $ 645,000          
Variable interest rate 4.30%          
Credit facility, revolving credit loan, remaining borrowing capacity $ 100,800          
Letters of credit outstanding $ 14,200          
Minimum [Member] | Unsubordinated term loan and Revolving credit facility [Member]            
Debt Instrument [Line Items]            
Collateral coverage percentage 50.00%          
Convertible Debt [Member]            
Debt Instrument [Line Items]            
Convertible Debt $ 258,750   258,750     $ 258,800
Debt Conversion, Converted Instrument, Rate 1.125%          
Debt Instrument, Interest Rate, Effective Percentage 5.15%          
Proceeds from Convertible Debt   $ 252,300        
Convertible note hedge shares           8,100
Warrants and Rights Outstanding $ 38,500          
Unamortized Debt Issuance Expense (5,101)   (5,799)      
Debt Instrument, Unamortized Discount $ (42,371)   $ (48,105)      
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]            
Debt Instrument [Line Items]            
Note conversion obligation fair value         $ (51,300) $ (57,400)
Convertible note hedge fair value         $ 50,600 $ 56,100