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Long-Term Debt (Schedule of Future Payments Related to Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2018, Principal $ 4,359  
2018, Interest 40,920  
2018, Principal and Interest Total 45,279  
2019, Principal 4,404  
2019, Interest 40,557  
2019, Principal and Interest Total 44,961  
2020, Principal 3,895  
2020, Interest 40,217  
2020, Principal and Interest Total 44,112  
2021, Principal 3,831  
2021, Interest 39,862  
2021, Principal and Interest Total 43,693  
2022, Principal 4,040  
2022, Interest 39,468  
2022, Principal and Interest Total 43,508  
Thereafter, Principal 619,979  
Thereafter, Interest 94,148  
Thereafter, Principal and Interest Total 714,127  
Total payments, Principal 640,508  
Total payments, Interest 295,172  
Total payments, Principal and future interest expense 935,680  
Interest (295,172)  
Deferred financing costs (4,641) $ (5,611)
Long-term debt 633,501 $ 579,679
2023 Notes [Member]    
Debt Instrument [Line Items]    
Discount on Notes (3,804)  
Premium on Notes $ 1,438