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Summary of Significant Accounting Policies Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Fully depreciated assets taken out of service | $ 1,400 | $ 10,400 |
Deferred Sales Commission Asset B-Shares Estimated Period Of Benefit | 8 years |  |
Amortization of deferred sales commissions | $ 11,980 | 15,054 | $ 12,699
Total Waived Fees | 413,700 | 662,700 | 764,300
Change in Voluntary Yield-related Fee Waivers | (245,800) |  |
Change due to competitive waivers | (5,200) |  |
Advertising Expense | $ 2,700 | $ 2,600 | $ 2,200
Number of operating segments | 1 |  |
Minimum [Member] |  |  |
Property and equipment, useful Life | 1 year |  |
Maximum [Member] |  |  |
Property and equipment, useful Life | 12 years |  |
Software and Software Development Costs [Member] |  |  |
Property and equipment, useful Life | 4 years |  |

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