Quarterly report pursuant to Section 13 or 15(d)

Financing Arrangements - Summary of Outstanding Indebtedness (Details)

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Financing Arrangements - Summary of Outstanding Indebtedness (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 27, 2018
Dec. 31, 2017
Feb. 28, 2015
Debt Instrument [Line Items]        
Stated interest rate       2.75%
Debt instrument, face amount $ 736,083   $ 619,064  
Unamortized bond discounts, fair value adjustments and issue costs, net (45,366)   (41,136)  
Total carrying value of debt 736,083   619,064  
Less: current portion, net (16,656)   (20,106)  
Total non-current 719,427   598,958  
Second Lien Credit Agreement        
Debt Instrument [Line Items]        
Debt instrument, face amount 124,626   0  
Term loan facility        
Debt Instrument [Line Items]        
Debt instrument, face amount 487,500   490,625  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 78,000   78,000  
Convertible senior notes        
Debt Instrument [Line Items]        
Stated interest rate 2.75% 2.75%   2.75%
Debt instrument, face amount $ 82,500   82,500  
Total carrying value of debt 82,500      
Subordinated Debt        
Debt Instrument [Line Items]        
Stated interest rate   10.00%    
Debt instrument, face amount 124,626   0  
Other debt        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 8,823   $ 9,075