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Summary of Significant Accounting Policies Reclassification Adjustments to Prior Period Cash Flow Statement (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Net increase in cash $ (3,405) $ 45,750
Net Cash Provided by (Used in) Operating Activities (32,053) 4,710
Net Cash Provided by (Used in) Financing Activities $ 281,835 200,329
Reclassifications    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Net Cash Provided by (Used in) Operating Activities   (2,000)
Net Cash Provided by (Used in) Financing Activities   2,000
PFG | Reclassifications    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Net Cash Provided by (Used in) Financing Activities   $ 28,400