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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands | 2 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) vote $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) shares | Dec. 31, 2012 $ / 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 |  | 210,538,896 | 210,216,043 | 209,867,426 | 209,529,412
Common stock, shares outstanding |  | 210,538,896 | 210,216,043 | 209,867,426 | 209,529,412
Common stock dividends declared | $ |  | $ 0 | $ 50,036 | $ 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 |  | 130,538,896 | 130,216,043 | 129,867,426 | 129,529,412
Common stock, shares outstanding |  | 130,538,896 | 130,216,043 | 129,867,426 | 129,529,412
Shares issued during the period |  | 322,853 | 348,617 | 338,014 |
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 | 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 |  |  |
2011 Equity Incentive Plan [Member] | Restricted Share Units [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends | $ | $ 382 |  |  |  |

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