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Dividends (Tables) | 12 Months Ended
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Dec. 31, 2017
Dividends [Abstract] |
Dividends Declared [Table Text Block] | Interim dividends declared on Class A common stock and redeemable preferred stock for each quarter of the respective years ended December 31 were as follows:
|  | 2017 |  | 2016 |  | 2015 |
First Quarter |  | $ | 0.075 |  | $ | 0.075 |  | $ | 0.075 |
Second Quarter |  |  | 0.075 |  |  | 0.075 |  |  | 0.075 |
Third Quarter |  |  | 0.075 |  |  | 0.075 |  |  | 0.075 |
Fourth Quarter |  |  | 0.085 |  |  | 0.075 |  |  | 0.075 |
|  | $ | 0.31 |  | $ | 0.30 |  | $ | 0.30 |

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Tabular disclosure of information related to dividends declared, including paid and unpaid dividends. + References No definition available. + Details
Name: | us-gaap_DividendsDeclaredTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration