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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) vote $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) $ / shares shares
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized | 500,000,000 |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0 |  |  |
Common stock, shares issued | 211,072,508 | 210,711,224 | 210,538,896 | 210,216,043
Common stock, shares outstanding | 211,072,508 | 210,711,224 | 210,538,896 | 210,216,043
Common stock dividends declared | $ | $ 0 | $ 0 | $ 0 | $ 50,036
Dividends payable | $ |  | $ 12,509 | $ 12,509 |
Salary period paid upon employee leaving | 30 days |  |  |
Class A Shares Of Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized | 420,000,000 | 420,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0 | $ 0 |  | $ 0
Common stock, shares issued | 131,072,508 | 130,711,224 | 130,538,896 | 130,216,043
Common stock, shares outstanding | 131,072,508 | 130,711,224 | 130,538,896 | 130,216,043
Shares issued during the period | 361,284 | 172,328 | 322,853 |
Number of votes per share (in votes) | vote | 1 |  |  |
Class B Shares Of Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized | 80,000,000 | 80,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0 | $ 0 |  |
Common stock, shares issued | 80,000,000 | 80,000,000 | 80,000,000 | 80,000,000
Common stock, shares outstanding | 80,000,000 | 80,000,000 | 80,000,000 | 80,000,000
Number of votes per share (in votes) | vote | 5 |  |  |

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