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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Investments [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance | $ 164 | $ 161 | $ 158 | $ 157
Asset, gain (loss) included in earnings | 4 | (3) | 10 | 1
Asset ending balance | 168 | 158 | 168 | 158
ARS Purchase Commitments [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance |  |  |  | 0
Asset, gain (loss) included in earnings |  |  |  | 911
Asset ending balance |  | 911 |  | 911
Interest Rate Lock Commitments [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance |  | 14,024 |  | 9,161
Liability beginning balance |  |  |  | 923
Asset, gain (loss) included in earnings |  | (571) |  | 4,292
Liability, gain (loss) included in earnings |  |  |  | 923
Asset ending balance |  | 13,453 |  | 13,453
Liability ending balance |  | 0 |  | 0
Auction Rate Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance | 89,743 | 84,185 | 84,926 | 86,802
Asset, gain (loss) included in earnings | 502 | 1,341 | 1,144 | 3,574
Asset, purchases | 17,050 | 5,000 | 22,050 | 11,775
Sales and settlements | (125) | (1,425) | (950) | (13,050)
Asset ending balance | 107,170 | 89,101 | 107,170 | 89,101
Auction Rate Securities Purchase Commitment [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance | 878 | 1,540 | 849 |
Liability beginning balance | 359 | 559 | 645 | 1,369
Asset, gain (loss) included in earnings | (878) | (629) | (849) |
Liability, gain (loss) included in earnings | 105 | 417 | 391 | 1,227
Asset ending balance | 0 | 911 | 0 | 911
Liability ending balance | 254 | 142 | 254 | 142
Municipal Bonds [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance | 36 | 85 | 44 | 81
Asset, gain (loss) included in earnings | 0 | 2 | (8) | 6
Sales and settlements | 0 | (62) | 0 | (62)
Asset ending balance | $ 36 | $ 25 | $ 36 | $ 25

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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