Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Rate On Term Loan		4.53%
Loan Maturity Date	Jun. 30, 2026
Loans, Unpaid principal balance	$ 20,184	$ 4,873
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Rate On Term Loan	0.00%
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Rate On Term Loan	4.58%
Loan Maturity Date	Dec. 15, 2046