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Long-Term Obligations Principal Payments (Tables)
 6 Months Ended
Jun. 30, 2017
LOng-Term Obligations Disclosure [Abstract]  
Schedule of Maturities of Long-term Debt [Table Text Block]
Principal payments    

As of June 30, 2017, aggregate future principal payments for long-term obligations (including any current portion of long-term debt) were as follows (in thousands):

Years Ending
 
 
2017
 
$
—

2018
 
—

2019
 
—

2020
 
75,000

Thereafter
 
—

Total
 
$
75,000