Supplemental Data - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 17, 2017
Supplemental Data - Statements of Cash Flows
Cash paid for interest (including capitalized interest)	$ 900,125	$ 921,238	$ 996,183
Cash received for interest	40,795	15,037	6,925
Cash paid for income taxes	30,552	31,308	40,362
Capitalized interest	980,299	1,012,177	1,015,901
Master Transaction Agreement, net of deferred tax of $166,161	497,145
Employee benefits paid in Class A common stock	$ 27,004	$ 27,322	23,164
Interest rate (as a percent)	7.75%
Deferred other tax expense (benefit)	$ 166,161
2 3/8% Convertible Notes due 2024
Supplemental Data - Statements of Cash Flows
Initial equity component of the 2 3/8% Convertible Notes due 2024, net of deferred taxes of $92,512			$ 159,869
Interest rate (as a percent)	2.375%		2.375%	2.375%
Deferred taxes			$ 92,512