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Leased Properties (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Leases, Operating [Abstract] |  |  |
Operating lease, rental expense | $ 1.5 us-gaap_OperatingLeasesRentExpenseNet | $ 1.1 us-gaap_OperatingLeasesRentExpenseNet | $ 0.9 us-gaap_OperatingLeasesRentExpenseNet
2015 | 1.4 us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths |  |
2016 | 1.4 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearTwo |  |
2017 | 1.3 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearThree |  |
2018 | 0.7 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFour |  |
2019 | 0.2 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFive |  |
Total | $ 5.0 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |

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- Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the fifth rolling twelve months following the latest balance sheet presented for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References No definition available. + Details
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- Definition Amount of required minimum rental payments maturing in the forth rolling twelve months following the latest balance sheet presented for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References No definition available. + Details
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Period Type: | instant

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- Definition Amount of required minimum rental payments maturing in the third rolling twelve months following the latest balance sheet presented for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References No definition available. + Details
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- Definition Amount of required minimum rental payments maturing in the second rolling twelve months following the latest balance sheet presented for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References No definition available. + Details
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- Definition Amount of required minimum rental payments maturing in the next rolling twelve months following the latest balance sheet presented for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
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Balance Type: | debit
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