Income Taxes Reconciliation of effective tax rate (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory Federal rate	35.00%	35.00%	35.00%
Change in deferred tax asset valuation allowance reversal	(210.50%)	0.00%	0.00%
Change in deferred tax asset valuation allowance - federal tax rate change	(126.40%)	0.00%	0.00%
Increase (decrease) resulting from:
State and local taxes, net	4.70%	(17.40%)	10.40%
Change in valuation allowance	(65.70%)	14.50%	(86.40%)
Change in federal tax rate	126.40%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	29.20%	0.00%	0.00%
Foreign tax rate differential	0.10%	(14.30%)	17.90%
Meals & entertainment	1.40%	(9.00%)	11.60%
Alternative minimum tax	3.60%	(6.30%)	7.60%
Provision to return differences	(0.70%)	(4.50%)	24.40%
Executive life insurance	0.90%	(3.10%)	2.40%
Captive insurance income	0.30%	(3.00%)	0.00%
Change in uncertain tax positions	7.70%	0.60%	56.20%
Other items, net	(0.10%)	1.10%	(4.90%)
Provision for income taxes	(194.10%)	(6.40%)	74.20%