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Borrowing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2014
Aggregate Payments of Principal on Long-Term Borrowings | The table below presents the aggregate scheduled payments of principal on long-term borrowings for each of the next five years and thereafter are as follows (amounts in thousands):
Year | Amount
2015 | $ | 310,609 |
2016 | 249,185 |
2017 | 88,105 |
2018 | 220,239 |
2019 | 221,189 |
Thereafter | 1,108,526 |
Net unamortized premiums | 14,393 |
Total | $ | 2,212,246 |

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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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Period Type: | duration