XML 97 R72.htm IDEA: XBRL DOCUMENT v3.6.0.2
Debt Obligations (4.25% Senior Unsecured Notes) (Details) - Senior Notes - 4.25% senior unsecured notes due June 1, 2024
Dec. 31, 2016
Debt Instrument [Line Items]  
Stated rate 4.25%
Maximum  
Debt Instrument [Line Items]  
Maximum interest rate on debt instrument 6.25%