Income Taxes Income Tax Reconciliation of Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Effective Tax Rate [Abstract]
Effective Income Tax Rate Reconciliation, Federal taxes at statutory rate		$ 34,865	$ 29,671	$ 42,113
Effective Income Tax Rate Reconciliation, State and local taxes – net of federal tax benefit		5,981	5,636	3,420
Effective Income Tax Rate Reconciliation, Deferred asset re-measurement as a result of Tax Act	$ 6,500	0	0	6,520
Effective Income Tax Rate Reconciliation, Equity Compensation		(1,251)	(254)	(1,368)
Effective Income Tax Rate Reconciliation, Manufacturing deduction		0	0	(3,262)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount		(3,493)	(2,817)	0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount		2,336	1,390	820
Provision (benefit) from income taxes		$ 38,438	$ 33,626	$ 48,243