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Summary of SIgnificant Accounting Policies-Annual Reclassification of Prior Period Cash Flow Statement (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net Cash Provided by (Used in) Operating Activities $ 36,643 $ (9,455) $ 23,649
Net Cash Provided by (Used in) Investing Activities (319,985) (217,795) (569,689)
Net Cash Provided by (Used in) Financing Activities $ 276,952 243,663 $ 506,831
Reclassifications      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net Cash Provided by (Used in) Operating Activities   (4,500)  
Net Cash Provided by (Used in) Investing Activities   1,400  
Net Cash Provided by (Used in) Financing Activities   5,900  
PFG | Reclassifications      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net Cash Provided by (Used in) Investing Activities   7,800  
Continuing Operations [Member] | Reclassifications      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net Cash Provided by (Used in) Investing Activities   $ 9,200