Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles - Revenue Recognition (Details)

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Summary of Significant Accounting Principles - Revenue Recognition (Details)
12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Period uncollected fees are written off for credit receivables 180 days
Period uncollected fees are written off 60 days