Income Taxes (Details 2)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective tax rate reconciliation
Statutory U.S. federal tax rate	35.00%	35.00%	35.00%
Increase (decrease) in rate resulting from:
Effect of noncontrolling interest	0.20%	(4.70%)	5.30%
State and local income taxes, net of related federal taxes	(4.20%)	5.80%	1.40%
Income taxes on foreign earnings	(2.20%)	(1.30%)	9.40%
Change in federal and state tax rates	374.80%	0.00%	0.00%
Goodwill impairment	(93.50%)	0.00%	(35.60%)
Equity Method Investments	(0.40%)	0.30%	1.90%
Tax effect of one-time transition tax	(7.10%)	0.00%	0.00%
Release of unrecognized tax benefts	3.00%	0.10%	0.50%
Nondeductible compensation	(2.50%)	2.00%	(5.00%)
Tax associated with accrued and unpaid dividends	0.10%	3.20%	(13.60%)
Federal income tax credits	(0.00%)	(7.30%)	(0.00%)
Change in pre-acquisition tax liability and other costs	0.00%	0.00%	3.50%
Other, net	4.40%	(0.80%)	(0.70%)
Effective tax rate	307.60%	32.30%	2.10%