CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Accumulated depreciation	$ 640,214	$ 539,213
Preferred stock, $0.01 par value; 10,000,000 shares authorized, zero shares issued and outstanding as of September 30, 2020 and December 31, 2019
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	10,000,000	10,000,000
Shares issued (in shares)	0	0
Shares outstanding (in shares)	0	0
Common stock, $0.01 par value; 500,000,000 shares authorized, 206,928,325 and 205,208,018 shares issued and outstanding as of September 30, 2020 and December 31, 2019, respectively
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	500,000,000	500,000,000
Shares issued (in shares)	206,928,325	205,208,018
Shares outstanding (in shares)	206,928,325	205,208,018