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Detail of Certain Balance Sheet Accounts Detail of Certain Balance Sheet Accounts (Property and Equipment) (Details Textual) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Capital expenditures incurred for purchase and construction of assets $ 71,000    
Capital Expenditures Incurred but Not yet Paid 10,364 $ 19,920 $ 15,900
Land and Building [Member]      
Property, Plant and Equipment [Line Items]      
Acquisition of fixed assets 67,800    
Land and Building [Member]      
Property, Plant and Equipment [Line Items]      
Acquisition of fixed assets $ 29,200