| Stockholders' Equity (Tables) | 9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Sep. 30, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stockholders' Equity Note [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Share-based Compensation, Performance Shares Award Unvested Activity [Table Text Block] |  The activity related to equity awards granted to employees, executives and board members was as follows:
 
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for unvested performance shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- References No definition available. 
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