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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
QuarterlydividendsdeclaredTableTextBlock [Table Text Block] | Dividends The Board declared quarterly dividends as follows:
(amounts per share) | 2020 |  | 2019
First quarter | $ | 0.40 |  |  | $ | 0.30 |
Second quarter | 0.40 |  |  | 0.30 |
Third quarter | 0.40 |  |  | 0.30 |
Fourth quarter | 0.40 |  |  | 0.30 |

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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

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- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration