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Debt (Tables) | 12 Months Ended
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Dec. 31, 2012
Payments Expected for Term Credit Facility Over Subsequent Five Year Period | The following payments are expected for the Term Credit Facility over the subsequent four year period:
|  | Payments due by Period (amounts in thousands) |
|  | 2013 |  |  | 2014 |  |  | 2015 |  |  | 2016 |
Term Credit Facility |  | $ | 17,500 |  |  | $ | 26,250 |  |  | $ | 30,000 |  |  | $ | 112,500 |

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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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration