| Stockholders' Equity (Tables) | 3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Mar. 31, 2016 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stockholders' Equity Attributable to Parent [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Dividends Declared [Table Text Block] | 
The following table presents cash dividends declared by the Company on its common stock during the three months ended March 31, 2016, and the four immediately preceding quarters:
 
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| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | 
Accumulated other comprehensive income at March 31, 2016 and December 31, 2015 was as follows:
 
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| Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | 
The following table summarizes reclassifications out of accumulated other comprehensive income for the three months ended March 31, 2016 and 2015:
 
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| X | ||||||||||
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- Definition Tabular disclosure of information related to dividends declared, including paid and unpaid dividends. No definition available. 
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| X | ||||||||||
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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). No definition available. 
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- References No definition available. 
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