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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
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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 |

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