Income Taxes Income Taxes Details 1 (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2019	[1]	Sep. 30, 2019	[1]	Jun. 30, 2019	[1]	Mar. 31, 2019	[1]	Dec. 31, 2018	[1]	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
United States																	$ 441,579	$ 399,123	$ 347,680
Foreign																	22,853	42,609	52,578
Income before income taxes	$ 195,172		$ 72,869		$ 96,083		$ 100,308		$ 126,012		$ 86,036		$ 119,315		$ 110,369		$ 464,432	$ 441,732	$ 400,258

[1] Includes Gains (losses) on divestitures and impairment charges, net, as described in Note 16.