Income Taxes (Details)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Taxes
Federal statutory income tax rate (as a percent)	21.00%
Effective tax rate on income before provision for income taxes including income attributable to noncontrolling interests (as a percent)	29.00%	21.30%
Effective tax rate on income before provision for income taxes and noncontrolling interests (as a percent)		29.00%
Minimum period of statute of limitations of state and foreign jurisdictions	3 years
Maximum period of statute of limitations of state and foreign jurisdictions	5 years