Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Schedule of Long Term Debt Maturity (Details)

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Long-Term Debt - Schedule of Long Term Debt Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Remainder of 2018 $ 2,750  
2019 11,000  
2020 608,000  
2021 170,100  
2022 1,042,250  
2023 0  
Thereafter 0  
Total principal payments 1,834,100  
Less:    
Unamortized deferred debt costs and discounts 27,981  
Total debt on condensed consolidated balance sheet $ 1,806,119 $ 1,718,297