Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Future interest payable - current	[1]	$ 98,212	$ 102,294
Future interest payable - long-term		$ 2,185,984	$ 2,232,570
Stockholders' equity
Preferred stock, par value		$ 0.001	$ 0.001
Preferred stock, shares authorized		25,000,000	25,000,000
Preferred stock, shares issued		0	0
Preferred stock, shares outstanding		0	0
Common stock, par value		$ 0.001	$ 0.001
Common stock, shares authorized		750,000,000
Common stock, shares issued		508,415,378	508,065,495
Treasury stock, shares		1,828,444	1,652,771
Future interest payable on senior secured notes
Debt Instrument [Line Items]
Future interest payable - current		$ 83,751	$ 86,054
Future interest payable - long-term		$ 59,998	$ 78,860

[1] Our current maturities of long-term debt as of March 31, 2020 include $83.8 million of future interest payable related to the 2021 Senior Secured Notes and 2022 Senior Secured Notes that is due within the next twelve months.