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Nature of Business and Significant Accounting Policies - Narrative (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) TradeName contract | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 01, 2012 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Percentage of contracts with the government |  |  | 78.00% | 82.00% | 80.00% |
Number of contract types | contract |  |  | 3 |  |  |
Deferred compensation plan expense |  |  | $ 2,100,000 | $ 1,900,000 | $ 1,700,000 |
Impairment of intangible assets |  |  | $ 0 | $ 0 | $ 0 |
Acquired intangible assets, weighted average useful life |  |  | 12 years 2 months 12 days |  |  |
Assets derecognized |  |  |  |  |  | $ (27,300,000)
ASU 2014-09 |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Cumulative effect on retained earnings |  | $ 1,500,000 |  |  |  |
Servicing Contracts |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Acquired intangible assets, weighted average useful life |  |  | 12 years 7 months 6 days |  |  |
Servicing Contracts | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Finite-lived intangible assets, useful life |  |  | 7 years |  |  |
Servicing Contracts | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Finite-lived intangible assets, useful life |  |  | 16 years |  |  |
Trade Names |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Finite-lived intangible assets, useful life |  |  | 9 years |  |  |
Number of trade names | TradeName |  |  | 4 |  |  |
Acquired Technologies |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Finite-lived intangible assets, useful life |  |  | 11 years |  |  |
Other Capitalized Property Plant and Equipment | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 3 years |  |  |
Other Capitalized Property Plant and Equipment | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 15 years |  |  |
Land, Buildings and Improvements | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 15 years |  |  |
Land, Buildings and Improvements | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 20 years |  |  |
Subsequent Event | ASU 2016-02 |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Cumulative effect on retained earnings | $ 4,000,000 |  |  |  |  |
Liabilities derecognized | 20,300,000 |  |  |  |  |
Assets derecognized | 15,200,000 |  |  |  |  |
Finance lease, ROU asset | 18,000,000 |  |  |  |  |
Finance lease, liability | 24,000,000 |  |  |  |  |
Operating lease, ROU asset | 5,500,000 |  |  |  |  |
Operating lease, liability | $ 5,600,000 |  |  |  |  |

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