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Long-Term Debt - Components Table (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Apr. 04, 2017
Dec. 31, 2016
Jul. 28, 2014
Long-Term Debt        
Long-term debt $ 917,721   $ 502,539  
Revolving Credit Facility        
Long-Term Debt        
Long-term debt $ 122,461   $ 14,100  
Weighted average interest rate, as a percent 3.20%   4.00%  
Convertible Senior Notes 1.00 percent due 2020        
Long-Term Debt        
Long-term debt $ 251,973   $ 241,068  
Interest rate, as a percentage 1.00%      
Aggregate principle amount $ 287,500      
Unamortized discount and capitalized debt issuance costs 35,527   46,432  
Senior Notes 5.125 Percent Due 2022        
Long-Term Debt        
Long-term debt $ 248,038   247,371  
Interest rate, as a percentage 5.125%     5.125%
Aggregate principle amount $ 250,000     $ 250,000
Capitalized debt issuance costs 2,000   $ 2,600  
Senior Notes 5.50 Percent Due 2025        
Long-Term Debt        
Long-term debt $ 295,249      
Interest rate, as a percentage 5.50% 5.50%    
Aggregate principle amount $ 300,000 $ 300,000    
Capitalized debt issuance costs $ 4,800