v3.8.0.1

Earnings Per Share (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2009 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares | Sep. 18, 2014 $ / shares
Debt Instrument [Line Items] |  |  |  |  |
Undistributed earnings allocated to participating unvested share-based payment awards, weighted outstanding shares |  | 5,200 | 5,100 | 4,400 |
Exchangeable Surplus Notes (in shares) |  | 5,800 | 5,700 | 5,500 |
Long-term debt | Exhangeable Surplus Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ | $ 500,000 |  |  |  |
Interest Rate | 5.36% |  |  |  |
Debt Instrument, Convertible, Conversion Ratio | 10.1235 | 11.7643 |  |  |
Surplus notes principal amount, for each | $ | $ 1 | $ 1 |  |  |
Exchangeable Surplus Notes (in shares) | 5,100 | 5,880 |  |  |
Exchange price of common stock, per share | $ / shares | $ 98.78 | $ 85.00 |  |  | $ 102.62

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