Income Taxes Income Tax Reconciliation of Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Effective Tax Rate [Abstract]
Effective Income Tax Rate Reconciliation, Federal taxes at statutory rate	$ 42,113	$ 32,125	$ 30,425
Effective Income Tax Rate Reconciliation, State and local taxes – net of federal tax benefit	3,420	3,652	2,820
Effective Income Tax Rate Reconciliation, Change in state NOL deferred asset – net of federal tax benefit	0	729	1,548
Effective Income Tax Rate Reconciliation, Deferred asset re-measurement as a result of Tax Act	6,520	0	0
Effective Income Tax Rate Reconciliation, Equity Compensation	(1,368)	0	0
Effective Income Tax Rate Reconciliation, Manufacturing deduction	(3,262)	(1,298)	0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	820	(32)	373
Provision (benefit) from income taxes	$ 48,243	$ 35,176	$ 35,166