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Long-Term Debt (Schedule of Future Payments Related to Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
2017, Principal $ 19,974  
2017, Interest 37,200  
2017, Principal and Interest Total 57,174  
2018, Principal 54,402  
2018, Interest 34,793  
2018, Principal and Interest Total 89,195  
2019, Principal 71,165  
2019, Interest 31,523  
2019, Principal and Interest Total 102,688  
2020, Principal 37,253  
2020, Interest 28,057  
2020, Principal and Interest Total 65,310  
2021, Principal 3,782  
2021, Interest 27,267  
2021, Principal and Interest Total 31,049  
Thereafter, Principal 404,710  
Thereafter, Interest 53,945  
Thereafter, Principal and Interest Total 458,655  
Total payments, Principal 591,286  
Total payments, Interest 212,785  
Total payments, Principal and future interest expense 804,071  
Interest (212,785)  
Fair value adjustments (2,877) $ 0
Deferred financing costs (5,611) (3,775)
Long-term debt 579,679 $ 652,567
2023 Notes [Member]    
Debt Instrument [Line Items]    
Discount on Notes (5,029)  
Premium on Notes $ 1,910