v3.10.0.1

Common Share Capitalization (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 13, 2018
Common Stock Capitalization [Line Items] |  |  |  |  |
Dividends declared (in usd per share) | $ 0.41 | $ 0.45 | $ 0.82 | $ 0.90 |
Payments of Dividends | $ (12,700) | $ (14,800) | $ (25,501) | $ (29,579) |
Common Shares Issued And Outstanding Upon Conversion of All Convertible Securities | 30,854,762 | 32,794,236 | 30,854,762 | 32,794,236 |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  | 1,550,000
Shares repurchased | 242,161 | 51,518 | 1,186,058 | 182,006 |
Stock Repurchased and Retired During Period, Value | $ 3,600 |  | $ 17,593 | $ 2,868 |
Stock Repurchases, Average Price Per Share | $ 14.98 |  | $ 14.83 |  |

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