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Concentration Risk Voluntary Fee Waivers (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Concentration Risk [Line Items]                      
Revenue $ (71,995) $ (83,254) $ (84,245) $ (94,112) $ (99,815) $ (101,727) $ (102,287) $ (106,722) $ (333,600) $ (410,600) $ (389,000)
Less: Reduction in Distribution expense 54,493 61,283 60,179 64,654 67,665 68,748 70,149 74,288 240,600 280,900 277,100
Operating income (17,502) (21,971) (24,066) (29,458) (32,150) (32,979) (32,138) (32,434) (93,000) (129,700) (111,900)
Less: Reduction in Noncontrolling interest 1,093 1,716 1,851 2,454 2,696 2,772 2,501 2,729 7,100 10,700 6,800
Pre-tax impact $ (16,409) $ (20,255) $ (22,215) $ (27,004) $ (29,454) $ (30,207) $ (29,637) $ (29,705) $ (85,900) $ (119,000) $ (105,100)