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Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Basis of Presentation [Line Items] |  |
Additional excess tax benefits | $ 2,638 |
Net cash provided by financing activities | 67,085 | $ (46,586)
Net cash provided by operating activities | $ 154,453 | 115,770
Percentage of credit losses on available-for-sale deb securities to total investment portfolio | 90.00% |
Accounting Standards Update 2016-09, Statutory Tax Withholding Component |  |
Basis of Presentation [Line Items] |  |
Net cash provided by financing activities | $ 2,604 | 3,233
Net cash provided by operating activities | $ 2,604 | $ 3,233

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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