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Accounts receivable	12 Months Ended
Accounts receivable	Dec. 31, 2016
Receivables [Abstract]
Accounts receivable	7. Accounts receivable Winthrop and its subsidiaries continuously monitor the creditworthiness of customers and establish an allowance for uncollectible accounts based on specific customer related collection issues. As of December 31, 2016 and 2015, there was no allowance for uncollectible accounts.