Debt (Tables)  | 
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2017  | |||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Debt [Table Text Block] | 
 
As of June 30, 2017, the carrying amount of the Company's long-term debt consists of the following: 
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| Schedule of Maturities of Long-term Debt [Table Text Block] | 
 The future scheduled principal payments of debt as of June 30, 2017 are as follows: 
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- References No definition available. 
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. No definition available. 
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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