Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2017
Income Taxes
Effective Income Tax Rate Reconciliation, Percent	10.40%		8.40%	23.20%	6.80%
Reduction in deferred tax asset				10.20%
Additional paid-in-capital adjustment		$ (4,382)
Settlements				$ 787
Tax amortization period				15 years
Deferred tax benefit		269,600		$ 269,600
Accounts payable, accrued expenses and other liabilities
Income Taxes
Tax, penalties and interest expense				2,300
Tax, penalties and interest provision		500		500
Accrued income taxes		2,700		2,700
New York state
Income Taxes
Net operating loss carryforwards		15,700		15,700
New York City
Income Taxes
Net operating loss carryforwards		$ 13,900		$ 13,900