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Shareholders' Equity - Stock Buyback Program (Details) - USD ($) shares in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Feb. 14, 2018
Equity, Class of Treasury Stock [Line Items] |  |
Treasury stock, value acquired | $ 40,182,000 |
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) | 1.8 |
Treasury stock, value acquired | $ 40,200,000 |

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