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v3.3.1.900

Summary of Significant Accounting Policies Narrative (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Fully depreciated assets taken out of service | $ 10,400 | $ 7,400 |
Deferred Sales Commission Asset B-Shares Estimated Period Of Benefit | 8 years |  |
Amortization of deferred sales commissions | $ 15,054 | 12,699 | $ 9,153
Total Waived Fees | 662,700 | 764,300 | 802,500
Change in Voluntary Yield-related Fee Waivers | (77,000) |  |
Change due to competitive waivers | (25,200) |  |
Advertising Expense | $ 2,600 | $ 2,200 | $ 2,900
Number of operating segments | 1 |  |
Minimum [Member] |  |  |
Property and equipment, useful Life | 1 year |  |
Finite-Lived Intangible Assets, Useful Life | 8 years |  |
Maximum [Member] |  |  |
Property and equipment, useful Life | 12 years |  |
Finite-Lived Intangible Assets, Useful Life | 11 years |  |
Software and Software Development Costs [Member] |  |  |
Property and equipment, useful Life | 4 years |  |

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