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Concentration Risk Voluntary Fee Waivers (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Concentration Risk [Line Items]                      
Revenue $ (11,027) $ (18,030) $ (21,333) $ (37,482) $ (71,995) $ (83,254) $ (84,245) $ (94,112) $ (87,800) $ (333,600) $ (410,600)
Less: Reduction in Distribution expense 7,627 13,797 16,528 27,896 54,493 61,283 60,179 64,654 65,800 240,600 280,900
Operating income (3,400) (4,233) (4,805) (9,586) (17,502) (21,971) (24,066) (29,458) (22,000) (93,000) (129,700)
Less: Reduction in Noncontrolling interest 0 0 (208) 208 1,093 1,716 1,851 2,454 0 7,100 10,700
Pre-tax impact $ (3,400) $ (4,233) $ (5,013) $ (9,378) $ (16,409) $ (20,255) $ (22,215) $ (27,004) $ (22,000) $ (85,900) $ (119,000)