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Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Jan. 02, 2018
Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Equity securities, carrying value |  |  |  |  |  | $ 41,107 |
Tax cuts and jobs act, incomplete accounting, estimated income tax expense | $ 1,000 |  |  | $ 2,000 |  |  |
Tax cuts and jobs act, incomplete accounting, change in provisional income tax expense related to deemed repatriation of Canadian earnings | $ 0 |  |  | $ 1,800 |  |  |
Federal Statutory Tax Rate | 21.00% |  | 35.00% | 21.00% | 35.00% | 35.00% |
Maximum [Member] |  |  |  |  |  |  |
Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Provisional information accounting incomplete measurement period |  |  |  | 1 year |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting standard adoption on retained earnings |  |  |  |  |  |  | $ 24,700
Percentage of cumulative effect of accounting standard adoption on retained earnings |  |  |  |  |  |  | 1.70%
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |
Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting standard adoption on increase retained earnings |  | $ 7,700 |  |  |  |  |
Decrease accumulated other comprehensive income (loss) |  | 7,700 |  |  |  |  |
Pre-tax gains and losses in realized investment gains (losses) | $ 500 |  |  | $ 1,400 |  |  |
Equity securities, carrying value | $ 1,400 |  |  | $ 1,400 |  |  |
Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |
Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Decrease to retained earnings due to accounting standard adoption to reclassify stranded tax effects from Tax Reform Act |  | $ 7,800 |  |  |  |  |

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