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Shareholders' Equity - Stock Buyback Program and Prospectus Supplement (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Feb. 14, 2018 | Nov. 09, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury stock, value acquired | $ 70,446,000 |  |
Common shares | February 2018 Stock Buyback Program |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchase program, authorized amount |  | $ 200,000,000 |
Treasury stock, shares acquired (shares) | 3,117,483 |  |
Treasury stock, value acquired | $ 70,400,000 |  |
Prospectus Supplement |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Maximum common stock value authorized under prospectus supplement |  |  | $ 150,000,000
Issuance of common stock under prospectus supplement (in shares) | 0 |  |

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