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Fair Value Fair Value - Level 3 Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Contingently convertible Series E units liability beginning balance $ 72,057 $ 66,938
Preferred shares derivative liability beginning balance 57,960 28,150
Issuances 0 0
Contingently convertible Series E units liability, remeasurement included in earnings (2,100) 5,119
Preferred derivative liability issuance 0 23,652
Preferred shares derivative liability remeasurement 4,830 6,158
Contingently convertible Series E units liability end balance 69,957 72,057
Preferred shares derivative liability ending balance $ 62,790 $ 57,960