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Shareholders' Equity (Narrative) (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) vote stock_class $ / shares shares | Mar. 31, 2016 $ / shares | Dec. 31, 2016 vote $ / shares shares | Sep. 06, 2011 USD ($)
Share Repurchases [Line Items] |  |  |  |
Number of classes of common stock | stock_class | 3 |  |  |
Preferred stock, authorized shares | shares | 500,000.0 |  | 500,000.0 |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  | $ 0.01 |
Preferred stock, issued shares | shares | 0 |  | 0 |
Dividends declared per share (in dollars per share) | $ / shares | $ 0.30 | $ 0.30 |  |
Common Class A [Member] |  |  |  |
Share Repurchases [Line Items] |  |  |  |
Number of votes | vote | 1 |  | 1 |
Share repurchase program, authorized amount | $ |  |  |  | $ 100,000,000
Number of shares repurchased | shares | 0 |  |  |
Remaining authorized repurchases | $ | $ 82,900,000 |  |  |
Common Class B [Member] |  |  |  |
Share Repurchases [Line Items] |  |  |  |
Number of votes | vote | 10 |  | 10 |
Common Class C [Member] |  |  |  |
Share Repurchases [Line Items] |  |  |  |
Number of votes | vote | 10 |  | 10 |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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