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Summary of Significant Accounting Policies (Deferred Softward Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Deferred software costs | $ 18.4 | $ 15.4 |
Capitalized Computer Software, Amortization | $ 6.0 | $ 4.0 | $ 1.3
Maximum | Software Development [Member] |  |  |
Useful lives | 36 months |  |
Maximum | Software and Software Development Costs [Member] |  |  |
Useful lives | 5 years |  |

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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 + Details
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