Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 11,000  
2019 11,000  
2020 608,000  
2021 79,500  
2022 1,042,250  
Thereafter 0  
Total principal payments 1,751,750  
Less:    
Unamortized discounts, premium and deferred debt costs, net 33,453  
Total debt on consolidated balance sheet $ 1,718,297 $ 1,698,778