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Borrowing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2013
Aggregate Payments of Principal on Long-Term Borrowings | Aggregate payments of principal on long-term borrowings for each of the next five years and thereafter are as follows (amounts in thousands):
Year | Amount
2014 | $ | 119,452 |
2015 | 311,208 |
2016 | 246,054 |
2017 | 310,725 |
2018 | 207,592 |
Thereafter | 979,572 |
Net unamortized premiums | 17,765 |
Total | $ | 2,192,368 |

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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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