CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
Accumulated depreciation	$ 611,405	$ 539,213
Preferred stock, $.01 par value; 10,000,000 shares authorized, zero shares issued and outstanding as of June 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, $.01 par value; 500,000,000 shares authorized, 205,560,680 and 205,208,018 shares issued and outstanding as of June 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)	205,560,680	205,208,018
Shares outstanding (in shares)	205,560,680	205,208,018